Bulletstorm: Full Clip Edition

The other solution is great if you want to play in very hard from the start. I recommend playing on normal first to enjoy the game and work on skillshots. Beating the game once unlocks overdrive mode. Then replay levels via chapter select on very easy, earning all skillshots. Each time you unlock all skillshots for a gun, you unlock infinite ammo for that gun in overdrive mode. I recommend doing all 131 skillshots, but at least finish all of the ones for the drill gun, the cannonball gun, the shotgun, and the flail gun. These are most important. I also used the pistol some too, so like I said, easier to just earn them all first.
Now pick overdrive mode from the main menu, and enable infinite ammo. In this mode, you can hold Y to bring up an old school weapon wheel. All weapons are unlocked, and if you did all skillshots, all have infinite ammo. This makes the game a blast, and if you have the duke nukem dlc then this mode becomes what Duke Nukem Forever should have been.
. *You should take note that the prologue is NOT included in overdrive mode, so you will have to pick it from chapter select of the regular campaign before or after completing overdrive mode.*
*Tips*
1. On top of having access to the weapon wheel, you can set two quick selects to the left and right of the d-pad. Set these as the drill gun and the shotgun.
2. The drill gun can kill all regular enemies with one shot, including the burnouts. Most of the time it will take off and kill a second one as well!
3. The shotgun's charge shot can decimate as many as 6 enemies at a time if they are bunched together. ALWAYS have a shot charged even if you are using another gun.
4. I used the drill gun for far away enemies and the shotgun for close enemies.
5. Use the charged shot of the cannonball gun on the fat mini bosses. This will break their armor, then pepper them with regular shots from that or the drill gun until they die.
6. The robot Dino section is a pain in the ass. Checkpoints suck, controls suck, and it gets stuck a lot. Be patient! Take cover and let your health regenerate. In the open section use the blown out section of building for cover. I had a hard time getting the Dino to shoot down the copters from any other spot.
7. Use the flail gun on the plant boss. 3-4 shots is enough to kill his first health bar, and one shot per sac/tenecle wad.
8. On the chain gun sections, hold RT and tap LT (with aim assist on) and your reticule will jump to enemies.
If you have any questions, feel free to ask in the comments. Good luck

Well, this was probably THE easiest "very hard" difficulty I've yet completed. Why? Because of Overkill Mode. If you want this run to be a true cakewalk, do it like me and...

1. Unlock Overkill Mode by finishing the campaign on Normal diffculty (not sure if beating it on lower difficulties, too, unlocks Overkill Mode, but I suppose it does).

2. Complete all skillshots for the Boneduster (the shotgun).

3. Start a new game on Overkill Mode (which lets you carry all weapons at once and grants you unlimited ammo for all weapons you've completed all skillshots for) on Very Hard difficulty and enable the Infinite Ammo option.

4. Blast your way through the entire run using the Boneduster's charged shot (yes, you have unlimited charged shots as well), which is incredibly powerful, has a range of about 100 feet, a huge spread and insta-kills all standard enemies and mini-bosses. A few mini-bosses may require a second blast, though.

The Boneduster's charged shot, however, did not work on the plant boss on act 4-2 for me. Therefore, I used a combination of the Peacemaker Carbine's standard rounds and the Flailgun's charged shot, which I also had unlimited ammo for.

If at any point (for the sniping section, for instance) you should need a different weapon, you will have a huge amount of skill points at your disposal, due to the constant "Burn" bonuses (for killing at least two enemies with one charged shot) you have been amassing.

Furthermore, as a little bonus on top of it, the Boneduster's charged shot is by far the most efficient way to blast Electroflies.

If you use Chapter Select to beat a run on Overkill Mode, don't panic upon not getting the achievement, as you cannot select the Prologue from the Overkill Mode menu. In order to obtain the achievement, you will have to replay the Prologue from the standard Campaign menu.

The best advice I can give is to not use too much ammo, or waste SP on upgrades you won't use.
Personally, I only unlocked charges on the Sniper, Pistol and the starting rifle, which I used frequently. One other you should deffinitely consider is the final weapons charge attack which lets you kill two, maybe three enemies at once. Thumper for the leash is recommended, but don't waste SP on upgrading it. Chain Gun is also useful for multiple kills.

During the actual game, try to use Trishka, Ishi and Serrano as bait and line up multikills. Unfortunately, on Very hard, there are several points this will be difficult, as the AI are about as smart as a New born baby.

Technical bits put the way the best skill shots for this mode are ones that require very little ammo to use.
E.g. in the Gardens, it's better to slam the baser (slow) enemies in to Cacti or feed them to the parasites.
In indoor areas, thump people in to the ceiling for "Flyswatter", use elecrtical cables as often as possible and vertigo is a great one. Hitting an enemy with the chain gun then kicking them off the map, in to Catci or even in to the water during The Marina sequence, also nets you the "Sadist" skill shot, make use of this.

The chain gun is also useful for 'area kills', aiming for the head, kicking them in to an enemy gets you three (possible four) skill shots at once.

Don't bother with collectibles, they can be earnt later in chapter select. Only hit the ones in the way of your mission path. Elctroflies are good for dispatching enemies, if the opportunity arises. You can also use the explosions of Newsbots to kill enemies, you'll habe to weaken an enemy first, but you'll get a skill shot and 500SP in one hit.




EDIT: at the end of the game, you unlock OVERKILL mode. This mode lets you use all weapons at once without having to changing them at a dropkit.
This should (as it lets you unlock other achievements) let you unlock the higher difficulty settings if you want to play on easy straight away.
Although, I would recommend doing all four of these achievements in one run and using OVERKILL to mop up missing achievements on Very Easy. Thanks to the SCHWARTZ 00 for reminding me of this.

EDIT: A friend of mine has confirmed you can also use 'Chapter Select' from a Very Easy play through and do the achievement a chapter at a time. The only bad thing is you will not get any bonus SP from the lower difficulties. Meaning if you do chapter select on Very Easy after completing you'll start with a bit of extra SP per chapter. Completing it on Very Easy and selecting Very Hard, will void this.