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.
- Chapter 4 – Take the torches off the wall, kill everybody.
- Chapter 5 – Kill enemies in the fire.
- 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.
- Chapter 9 – Be quicker than the big guys in Chapter 9 (?)
- Chapter 10 – Don’t break any glass tube in the laboratory.
- Chapter 11 – Drop enemies into fans.
- 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.