Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Bug Killer	Eliminate 100 Insectoids.
Demolition Expert	Kill 200 Monsters with Explosives.
Fighting Expert	Melee Kill 200 Monsters.
Nightmare No More	Clear on Nightmare Mode.
Not Enough Space	Unlock All Inventory Slots.
Rich Man	Have 1000 Coins in Inventory.
Shooting Expert	Kill 200 Monsters with Firearms.
Survivor	Clear on Easy, Normal, Hard Mode.
Weapons Expert	Upgrade Weapons Three Times.