OUTRIDERS

I finished this achievement with Devaststor and used an infinite spawn to finish every accolade needed but Reflect Bullets.

I managed to figure out that the Marsh Caverns expedition can be played forever.

To do this you choose the Marsh caverns expedition on tier 1. If it’s not there, just return to lobby and load back until it is available.

To get it to work, play through until you have to charge the crystal (big red pulsing rock). From here charge the rock about halfway and then stop, don’t stand in the circle anymore. Enemies will spawn for about 20 minutes (at least for me they did). Eventually they will stop. When they do, just charge the rock to about 1/4 left to charge then leave circle again. At this point the enemies will not stop spawning. You have have a constant flow of small enemies with about 3 or 4 alphas per wave. I did this for 2 hours last night before I unlocked the final accolades I needed. They never stopped spawning. I could’ve kept going if need be but I finished what I needed to do. When you kill all enemies just wait a second or two and you will see more show up in your radar.

For the reflect bullets, if still needed, choose the frontline expedition. Run through using reflect as much as possible. Make sure you’re skill points are put to lower cooldown and modded to make it last longer. Run through reflecting as much as possible, get to the boss, let it kill you and just retry. You can get about 100 reflects per run which at tier 1 doesn’t take too long. You can also do others on this map.

The infinite spawn should help everyone get some accolades done. The rock charge probably isn’t super specific, but you do need to charge and just leave circle at certain charge points.

Start story point at first city(world tier 1) —> reach across the river checkpoint

Don’t shoot any enemies as they spawn in just run right to the end up the stairs then do circles so there all bunched up you should have around 25-30 to shoot at on first pile up then around 15 then 10 and being on tier 1 they should die fairly fast

For skill accolades that you don’t need to kill just inflict status effects just play on the highest tier your currently on and run around in circles letting your skills hit them everytime the effect runs out, Youl also gain tier experience too for better loot

Video guide on roughly what to do works with a lot of different skills:
https://gamerdvr.com/gamer/colzoh/video/130970994

Easily the best place i've found to do this post-game is the expedition Archways of Enoch. There's around 200/300 enemies during the course of this almost all of which will charge you making it easy to lead them around bunch up and dispose of at your leisure. Can be pretty tricky if not at world tier one though so be warned

In order to gain this achievement, you have to obtain all the class ability accolades to the maximum level. All these accolades are cumulative over time when you use your skills, but it is important to know what conditions you have to meet to ensure you are efficient in reaching those accolade levels.

General Tips

Know the accolade conditions: This sounds obvious, but when you have a skill equipped, take the time to know what you have to do to achieve the accolade. Some skills require you to kill enemies to make it count, while others just require you to hit opponents with your skill – this makes things much easier. There are skills that require you to hit a minimum number of opponents for your accolade counter to go up, or you might need to take damage in order to heal / mitigate that damage. Don’t waste your time by using your skills in the wrong situation.

Play the game: The reality of Outriders is that there are plenty of enemies to take on, so you don’t need to farm an area if you want to raise your accolade counter. Provided you swap your skills over time (especially once you’ve reached the maximum accolade level for that skill) you’ll be in a position by the end of the game to be a long way towards your skills ticking off your accolades. The end game is running through Expeditions – repeatable maps with lots of enemies – that can be used to get those final skills accolades (provided you are willing to sacrifice your completion time i.e. don’t do this in random multiplayer games).

Playing hard mode: That said, the reality is that not sticking with your ‘best’ skills at all times means you are making Outriders harder for yourself. As an example, a Technomancer’s Blighted Rounds is an incredible skill that will let you mow down enemies at incredible speed. It won’t be that long before you will have reached the maximum accolade level for inflicting toxic status on 1250 enemies. However, then you have a choice – do you replace Blighted Rounds, making the gameplay tougher, or do you keep Blighted Rounds as an active skill, slowing down your ability to gain accolade levels on your other skills? The choice is up to you (trick question: keep Blighted Rounds once you get it) but you’ll have to manage the trade-off.

Some skills suck: As in all games, there are good skills, and there are weak skills. Because you have to max out all your accolades on a class for this achievement, you’ll need to deal with the bad skills too. Following on from the example above, Technomancers also have Fixing Wave, which heals you, your team mates (if any) and your turrets. The maximum accolade level requires 200,000 healing in total from this skill. If you are playing Outriders properly, you’ll be doing so much damage that you generally won’t need to heal yourself, while turrets don’t have a lot of health. Fixing Wave is just a weak skill that replaces other, much better options, but you’ll have to grind this out if you want to accolade using the Technomancer class.

Mod it up: Having the right skill mods on your armour can make gaining accolade outcomes much quicker. Once you’ve started to disassemble blue armour items, you’ll unlock those mods and be able to place them on other armour pieces for the price of some leather. If your accolade requires kills, look for mods that increase skill damage. If you have to hit enemies for the accolade, look for mods that increase the duration or range of that skill. You can look to put up to ten different skill mods on your armour (five armour pieces with two mod slots each) but focusing only on skill mods might leave your character a bit vulnerable to times when your skills are on cool down.

Class tree bonuses: Some of your choices in your class tree will impact on how your skills behave, such as lasting longer or providing additional benefits when you use them. Don’t depend on these contributions, but they can certainly help achieve those accolades.

Know thy enemy: Learn how many uses of your skills it takes to kill or disable an enemy. Know if they can shield themselves or avoid your status effects. It’s annoying to use your skill on an enemy only to have them survive a direct hit or Absorbing Armour-away that status effect, meaning you’ll have to wait for the cooldown to finish before you can use that skill again.

Drop the difficulty: If you want to make things easier for yourself, you can always drop the world tier or challenge tier. You won’t get the good item drops, but you will make it easier to complete the accolade requirements. It is probably best to save this for the end of the game, when getting great loot is less of a priority compared to completing the achievement, and you have a choice of Expeditions to play through.

Uno momento, Perforo: Kill, freeze, poison, burn, ash et al Perforos. Repeat thousands of times. Watch your accolade counters climb.

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Technomancer

Scrapnel – Kill 750+ enemies with Scrapnel: Look for mods that boost damage and the number of Scrapnel grenades before you go into cooldown. Make sure they can one-hit kill a Perforo at your preferred world tier and then use them to clear out these little guys. If you miss with a Scrapnel, remember that they then turn into proximity mines, so you can hopefully attract an enemy into them for the kill.

Cryo Turret – Hit 1000+ enemies with status effects: Honestly, just throw this turret out there and it will auto-aim at enemies. Easy. If enemies are in cover, throw the cryo turret over the cover and let it get to work.

Pain Launcher – Kill 500+ enemies: This is an annoying skill as you’ll have to get the timing right on when it launches versus where enemies have moved to. Pain Launcher has a mod that deals AOE damage when you place it, which counts kills achieved this way. Boosting the damage per rocket through a mod can also help achieve those kills.

Blighted Rounds – Use this skill to inflict toxic on 1250+ enemies: Very easy to do, since Blighted Rounds is an incredible skill that mows down enemies. Best used on weapons with large magazines and possibly backed up with armour mods that give you ammo for killing enemies.

Fixing Wave – Use this skill to restore 200,000 health: The worst skill to grind out for Technomancer. Ideally you’ll want to leave this for later in the game, when you have characters with health pools of several thousand points, along with the ability to throw out multiple turrets as healing turrets also counts. If you can team up with consenting players, healing their damage will also count. However, given how healing works in Outriders, this is a waste of a skill.

Cold Snap – Use this skill to freeze five enemies at once 150+ times: Best used against groups of Perforo or melee enemies like Cutthroats or Berserkers. Use an armour mod to boost its effective range, make sure you have at least five red dots around you and hit this skill. Just be aware of any enemies with abilities to ignore status effects (e.g. Alpha Perforo and Absorbing Armour).

Blighted Turret – Hit 1000+ enemies with a status effect: Another excellent, auto-aiming skill. What it lacks in range, it makes up for in a short cooldown and ability to degrade enemy stats, especially if you have the appropriate path in the class tree. Just throw it towards enemies and it will do the rest.

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Devastator

Earthquake – Kill 1000+ enemies: Look for a mod to boost Earthquake’s damage and the number of times it can be used before cooldown. Earthquake can reach a surprisingly large way forward and also provides a small AOE around your character. If it can one- or two-hit Perforo to death, you’ll be fine.

Golem – Absorb 100,000+ damage: There are mods that will make Golem last longer, or give you extra time when you kill an opponent. However, provided you use it regularly and don’t duck behind cover, it won’t be too long before you reach this accolade, especially if you start using Golem later in the game and / or at higher world tiers.

Gravity Leap – Kill 500+ enemies: You’ll be best off boosting your damage for this skill, but because you’ll be looking for kills, make sure you know it will do enough to finish off an enemy or five before you activate it.

Reflect Bullets – Hit 1000+ enemies with reflected bullets: Easy in some ways – activate this skill and then stand out in the open, catching bullets from all the enemies in front of you. When the skill ends, you’ll send the bullets back as an express delivery. DO NOT use the mod that lets you shoot but also lets through 50% of the damage - you'll want the full level of protection. This should be focused on human and feral enemies – there are better skills for fighting beasts.

Impale – Kill 750+ enemies: The most grindy of the Devastator skills. In its natural format, Impale only hits a single target, and it isn’t a guaranteed kill. Mod your armour to boost Impale’s damage, number of activations before cooldown and number of spikes per time – you’ll end up being able to kill four enemies every cooldown if you play it right. Turn down your world tier to guarantee those one-hit kills.

Tremor – Get 3500+ hits: If you have enemies around you, Tremor will hit them during its activation period. Use an armour mod to add two extra tremors each time you use this skill. This works best against groups of melee opponents or any enemy that likes to get close.

Boulderdash – Get 1500+ hits: Again, another skill best used against grouped melee enemies. Boosting its damage so that it possibly one-hit kills Perforo will make this a safer skill to use. Boulderdash isn’t recommended to use in fights against large numbers of ranged opponents – you probably won’t be able to reach enough enemies to make using this skill worth it.

Endless Mass – Pull 500+ enemies: Another relatively easy skill to use. The enemy effected by this skill will draw in in their surrounding friends. This is great to use against rushing melee opponents, although sometimes is a bit hard to aim. TEndless Mass can also be very useful for grouping up enemies to use other AOE skills like Gravity Leap on. No mods are needed to speed your progress on your way to this accolade.

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I don’t have enough experience with Trickster or Pyromancer classes to comment on those skills, but hopefully someone else can add to this information in the comments below. If that happens, I'll bring it up into this guide with attributed credit.