Chapter related achievements (requirements)

Chapter achievements. Every chapter has a specific achievement / requirement.

Requirements of each chapter

Chapter 1 - Kick enemies (5 of them) off the cliffs (kind of broken, you have to delete your save and do it on first try I think)

Chapter 2 - Don't use guns at all.

Chapter 3 - Open all doors with kicks. The last door (actually a bookshelf) doesn't count. After you speak with the monk, before breaking the bookshelf (point of no return), if you have not got the achievement by then, go back through the level and check everywhere. The achievement will pop at the last wooden door (just before saving the monk). If you break the bookshelf and enter the next room, you can't go back to explore.

Chapter 4 - Take the torches off the wall, kill everybody.

Chapter 5 - Kill enemies in the fire. Try to push them in the flames with heavy attack.

Chapter 6 - Don't kill humans, kill only monsters.

Chapter 7 - Beginning of the level, let the 2 monsters kill the humans.

Chapter 8 - Kill every enemy on greenhouse area. Just make sure to explore everywhere because some enemies spawn only if you walk far enough in some corners.

Chapter 9 - Be quicker than the big guys? I think the last two big guys (the ones who look like tanks from L4D) have to be left alive. Right before the end of the level, you enter a corridor full of monsters which leads to a room with a control switch where 2 human enemies with 2 shotguns are. After that, the last room with the elevator will be open. 2 big guys inside, don't kill them, run to the blue scanner and hop on the elevator.

Chapter 10 - Don't break any glass tube in the laboratory. Glass will break because some monsters will wake up. Just bring the fight where there are no glass tubes so you can be safe. The achievement unlocks after you finish the chapter.

Chapter 11 - Drop enemies into fans. Rolling (A on the controller) + attacking works well, they fall over the railing most of the time.

Chapter 12 - Kill enemies with all the barrels of acid.

Chapter 13 - Kill some enemies with the grinder (enviromental).

Chapter 14 - Let the boss destroy the walls and the achieve should pop.

Chapter 15 - Kill enemies with all airplane propellers.

[HoverinMoonBear]

Don't listen to this guide in regards to chapter 9 they're wrong.

[DarkOutX]

Oh, what a surprise to see you, rogermorse :D
Can't understand chapter 10: Glass will break because some monsters will wake up
But monsters wake up by script without any conditions 0_o

[Hit Bong&Play Invoker]

chapter 9 you can kill the big guys but you can't get hit by them, not just the ones in the last room but the whole mission

[Rushin]

Some of the achievements appear to be cumulative, somewhat. E.g. for chapter 13 I'm pretty sure you just need to use every grinder (at least once) across multiple runs (should be five grinders there).

[瞎几把玩]

可以全成就，可能触发机制有问题，多试几次就可以完成成就。
比如第9关的成就，就是最后一个房间的两个肌肉男不要触碰，然后引诱他两出房间转一圈，在他两回来之前完成扫描，进入电梯即可。只不过这个过程我重复了5次才解锁成就。

[The Nothing Man]

HIT THE FANS ACHIEVEMENT CHAPTER 11

To do this one you need to throw 15 enemies

in the fans on the center of the areas in the beginning of the level. Dont worry, its accumulative. You dont need to do this in one run. The enemies goes down with simple attacks using square button. Do not charge your attacks because you will lose the chance to try more hits until the enemies fall down in the fan.

[The Nothing Man]

also this guide thanks but really its so vague.
kill enemies .. doesnt say how many.. and there is an exact amount
I killed about 11 win fans.. no pop
sheesh if ya make a guide.. put a little effort in, dont copy paste from console cheev sites

[The Nothing Man]

nm you dont even need half the torches off the wall before this pops
its actually use X torches to kill Y mobs
not all torches off the walls

[The Nothing Man]

If anyone is there please let me know about lvl 4
Take the torches off the wall, kill everybody.

you cant reach some of the torches.. i just did this lvl 4 times.. no pop

[CorvusCorax]

Thanks! Replaying both chapters worked. Actually, for the propellers I got it before interacting with all (this, too, seems to be cumulative). And the same goes for the barrel of acid. I didn't use all but got the achievement whilst 1 or 2 barrels remained.