Brink

Introduction:
-You must play by YOURSELF, if you want to unlock achievements. (Co-op will not work)
-IMPORTANT: Start a new character and do the challenges starting at rank 1. It will be easier much easier.
-IMPORTANT #2: Go to the campaign, select a mission and change the difficulty to "Easy". Now back out and play the challenges, this will make the challenges easier.
-All challenges must be done on 1 character.
-You must play and complete each challenge 3 times. (1-star, 2-star & 3-star)
-Challenges will get harder as you go through them multiple times.
-Save "Parkour This" for last.
-These challenges can be completed offline, and all achievements will unlock.
-You cannot unlock any non-challenge related achievements in this game mode.
-Once you complete a challenge, there will be a grey dot to fill the space beside it, letting you know you have completed it.
-You can verify completion (if you played online) if you have a leaderboard position.
-If you are having trouble, try upgrading your abilities.

Please view the videos and text descriptions below for my general strategies for each 3-star mission. My ranks in the videos range between 1-12, as they were recorded before it was known that ranking makes a difficulty difference.

Challenge 1 - Be More Objective:

This is easily the most frustrating of the challenges, and I suggest you leave it for last. The key to completing this challenge is to go from objective to objective as quickly as possible, and try to complete objectives with the least enemy resistance possible. If you run into a point where enemies are defending the objective, and your teammates are being useless, you'll have to kill 3 or more enemies, and then quickly make a break for the objective before they can spawn back. Don't count on your teammates to revive you, as usually they won't, but it is usually worth waiting a few seconds to see if they are able to pick you back up. While doing an objective (like repairing), make sure to crouch, and hide behind whatever you can while doing it. If enemies begin shooting at you, start swaying back and forth, making you harder to hit.

Challenge 2 - Parkour This:

The easiest challenge of all 4. You should have no problem getting this on your first try, but if you encounter any difficulties, view the path I used in the above video. There are slightly faster methods around, but they all use this path with small variations.

Challenge 3 - Escort Duty:

For this challenge you are asked to be an engineer, and escort a small tank to the end of the level. This challenge can be frustrating as you may die multiple times, but shouldn't cause too much trouble to pass. Make sure to always buff after spawning (Click left analog stick), and focus on the enemies over the tank.

Challenge 4 - Tower Defense:

For this challenge you will be an engineer, and to make it easier buy some abilities for your engineer class in the "Characters & Weapons" option from the main menu. Make sure to always plant a landmine in front of the command post, and try to "Spawn camp" as much as you can. Turrets can also help you, but use them wisely, as some enemies will hack them to turn against you. If you do use a turret, plant it across the path of the command post, so it is able to kill enemies who try and hack the command post. Stay calm, and well hidden and avoid dieing at all costs. Good Luck with this!

Conclusion:
After completing all 4 challenges at the 3-star rating, you will have gotten the following achievements:





Note: Some of the above achievements may unlock in a different order.

Okay, there are a lot of solutions posted here, and all of them will work. However, I have a modification that turns this achievement from one of the most difficult to one of the easiest.

As others have pointed out, you should start a new level 1 character for this achievement. Immediately choose the "Battle Hardened" ability as well, as it will be helpful.

Then, begin with "Be More Objective" and complete the 1-star challenge. IF YOU LEVEL UP and get level 2 after the 1-star mission is completed, go into the 'abilities' menu and pick a new ability, then immediately press 'Y' to "sell all," which will reset you back to level 1. Choose "Battle Hardened" again.

Then simply go back and play "Be More Objective" for the 2-star challenge. Again, if you level up, repeat the ability process to reset yourself to level 1. The 3-star challenge should be extremely easy now.

You want to stay at level 1 for every challenge because it makes the bots really easy to kill, and that's not to mention that it makes them completely unable to aim properly, and you will rarely die.

After completing the 3-star challenge on "Be More Objective," repeat the process next on "Escort Duty" and "Tower Defense." Since you're resetting to level 1 each time, you could do these in any order as they will remain the same difficulty. (Note: I admit that it IS handy to have the turret ability on "Tower Defense," but it really isn't necessary) After your last 3-star mission on all of these challenges, you don't have to reset again, because all that is left is "Parkour This," which has no enemies.

Using this method, I got this achievement tonight in under an hour, and never had to repeat a challenge. So, by remaining level 1 at all times, this achievement can be extremely simple.

I got the Achievement very easy a few moments ago. Here is what i did. If you do exactly like this, you wont have any problems at all.

1) Create a new character and use him on the missions

2) Do the following order of missions to get the sure fire deal here

- 1 Mission : Be more objective
Why: This is by far the hardest mission and the most unforgiving because you have to sprint from objective to objective while the enemies get cheap hits. Also if you die once, there is a high chance that you wont make it

- 2 Mission : Escort Duty
Why: Sometimes if your buggy gets crashed at the wrong spot, you will have enemies approaching from your back and from your front, which can cost you time and nerves, so do this mission as number two

- 3 Mission : Tower Defense
Why: Its simple, here you can just learn the pattern of enemies approaching. The final Wave on Level three will come with 9 enemies at once. Here it is essentiel to take out a whole unit of them before you get distracted and overrun. If your outpost got captured, just dont panic and take the enemies out with controlled shots (dont forget to buff your damage)

- 4 Mission : Parcours
Why: Its a simple mission and an easy thing to breeze through it

With this method i got the Achievement in almost no time and no effort

This is a great tip for Tower Defense ONLY (4th and final challenge). It helped me a lot so I hope for those of you that dislike this challenge, I hope this helps!

What I did was use the heavy archetype, and make my primary the Gotlung Minigun for its obvious pluses of damage, rate of fire and huge ammo capacity. Secondary can be any AR with an underslung grenade launcher just for some cleaning up or early pickings as the AI run out of the tunnels.

The important part is this. You don't ever have to reload your weapon. How is it so simple? After you kill a wave, you go back to the command point, go to change weapon (the game will pause), switch to another gun then back to the Gotlung. Ding! Ammo restored, no reloads. You can stay atop your tower, aim down the sight to let the weapon spin up and let loose as soon as the AI pop out of the tunnels.

A small note: it only takes about 30-35 bullets to take out the group as they're exiting. After you kill the group, you have plenty of time to "reload" and set up for the next group.

I did try this earlier with the EZ-Nade AGL, but the delay of grenades, the path of them being a little unpredictable, and the fact that you only get six shots didn't sit well with me personally.

So happy camping, guys 'n girls!

You may think the common-sense approach to these is to play through them at the start to unlock weapons and attachments, then come back to them once you've got a high level character and lots of upgrades.

Unfortunately the difficulty appears to increase with level, if anything getting harder, not easier! I did manage to 3 star the objective challenge with a lvl 20 engineer (2 mines + max turret), but the 'Tower Defense' was just a joke, especially the last round.

So as suggested elsewhere using a new low level character would appear to be key here. However i'd go further and say would need to keep the character low level! That is every so often, say when hitting level 3 or 4, go to the abilities screen and 'sell' your upgrades. This will have the effect of losing an upgrade point and demoting by 1 level. So if level 4, sell everything, buy an upgrade, then 'sell' again. You'll find yourself back at level 2 with just 2 upgrades available. I then choose the health boost and 3rd person view when interacting with objectives useful.

You still need to employ the right tactics for each challenge and some luck always helps, but I found this much easier than trying with a high level character.

I did 'objectives' first, then 'tower defence', followed by 'escort' and finally 'parkour', though luck still plays a major factor in completing these in my opinion.

For 'objectives', I found initially speed to be important to 'blow' the first objective before enemies showed up. After which I often had to help my team AI to take down a wave of enemies, so that eventually they could 'spawn camp' the enemy spawn and let me get on with the other objectives.

For 'Tower defence' its really only the last round that poses any difficulty as you'll get swamped from almost everywhere. One tactic I used here was to rush into the first spawn area and take out the guys (using a sub-machine gun' with high damage and fast rate of fire), before they entered the main arena. Of course when you get back, the other spawns are likely to be crawling all over you, but I found it gave me a fighting chance. Just make sure you equip some wepaons with a large reserve of ammo.

For 'Escort' I'd often prepare a level, by placing a mine and hacking any consoles, before returning to repair the vehicle. Then I found taking out each wave of enemies as fast as possible was best (again secondary weapon sub-machine gun was effective at close ranges). If the vehicle got damaged I tended to leave one enemy alive, to stop full respawns, though things happened so quick i'm not sure if that actually worked.

The suggested solutions are fine, but one thing to be aware of: the achievement must be earned on a single character. I got 3 stars on two of them with my first character and created a new one to try the remaining two. Once I got 3 star on them, the achievement still didn't unlock. I checked, and my name was on the leaderboard for all the challenges. I went back and got all the three stars on a single character and it unlocked.

Weapons upgrades do carry over between characters, though.

I thought about starting a new character to just do the challenges but ran through the first two without problems with my lvl 14, it adds to the xp so why not?

"Be more objective" is best with a light body type to run as fast as possible to objectives and do them while the crappy AI is confused.

"Parkour" is super easy if you follow the guide, light body type again.

"Escort duty" and "Tower defense" (the latter being the only one thet proved tricky) are most easily done with a heavy body type and the Chinzor machine gun, the CARB-9 is pretty good to fall back on if you need to, just make sure on "Tower defense" you have a landmine in play at all times in front of the command post and you know what door(s) the enemies are spawning from, and it's peachy.

In addition to other guides, it is very advisable to use a level 0 character for all challenges. Parcour could be done with every level. If you buy a perk and then sell erverything your level will go down to 0 again and that would be much easier for the hard challenges! For example on the Escort Mission with level 4, there were about 6-7 enemies at once, but on level 0 there were only 3 new enemies spawning! I only had problems on the first try of the Tower Defence Mission, but on the second try it was very easy for me. Hope I could help you :)