Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Alter ego	Unknown.
Completionist	Get all achivements.
Environmental hazard	Unknown.
Heartbreaker	Unknown.
Hoarder	Have 12 bullets at the same time.
Hunter	Kill every type of enemy in game.
Husk	Finish the game.
Ninja	Get to the police station without being detected.
Professional speleologist	Exit caves in under N minutes.
Runner	Escape the monster in the police station.
Welcome to Shivercliff	Finish the prologue.
Who's anton?	Find the underground research station.