Complete the following tasks to unlock the corresponding achievement. To view your achievements and stats in Steam, select "Community", then "My profile", then "View all my games", then the game and view stats.

Achievement	How to unlock
Dead Orc = Good Orc	Kill 1,000 orcs.
Deck the Halls	Complete the Hallway using only the Arrow Wall trap, weapons, and spells.
Defender	Complete act 1.
Droppin' Ten Large	Kill 10,000 orcs.
Giblet Storm!	Gib more than 200 enemies on one level.
Great Balls of Fire!	Get 300 fireball kills in one level.
In your Face!	Get 100 acid pot kills in one level.
Keepmaster	Complete act 2.
Legendary Defender	Complete Act 1 on Nightmare mode.
Legendary Keepmaster	Complete Act 2 on Nightmare mode.
Legendary War Mage	Complete Act 3 on Nightmare mode.
Lights Out!	Get 20 chandelier kills in one level.
Master War Mage	Complete act 3.
Member	30k Club	Kill 30,000 orcs.
Natural 20!	Get a 20 kill streak.
No Traps for You!	Win an act 2 or 3 level without using any traps.
Ogre Bisque	Kill an Ogre in a Lava Pit or an Acid Pit.
Perfect 10!	Get a 10 kill streak.
Pow! Pow!	Get 50 kills with explosive barrels on one level.
Series of Tubes	Connect your Robot Entertainment account to your Steam account.
Sg1	Go through portals 20 times in one level.
Skin of your Teeth	Win a level with 1 rift point left.
Tenderized!	Get 50 pounder kills in one level.
Tunnel Vision	Win an act 2 or 3 level using a single trap type.
Ultimate War Mage	Earn 5 skulls on every level on War Mage difficulty.
What a Mess!	Get a 30 kill streak.
Who Wants Pancakes?	Get 50 kills with the rolling log in one level.
Who Wants Some?!	Get a 40 kill streak.