Here is the full list of all 14 Orc Attack: Flatulent Rebellion achievements.
Kill 100 enemies.
Win a multiplayer mission (local or online).
Bring back to life 1 Orc warrior killed in combat.
Complete a level without taking any damage.
Prevent Master Muck from taking any damage in one of the escort levels.
Kill 1000 enemies.
Hit 1000 enemies without being touched by them.
Jump on the shoulders of a teammate without scrolling over a meter and do a full level on piggyback.
Collect 300 coins in one combat level.
Wear all the hats, helmets and masks.
Reach experience Level 15.
Kill the Mad Man.
Collect all the Black Stones.
Kill the Mad Man in Nightmare mode.