Here is the full list of all 51 Smintheus achievements.
You succesfully launched the game. Good job!
Win the game!
Complete the game in hardcore difficulty.
Win the game with one or more life points.
Complete deviated valley.
Get out of the Dyrfel Range mines.
Escape to the surface from Quacktale Sewers.
Leave your problems behind the Magical Forest.
Get past the first level!
Complete your first set of challenges.
Complete "Stinging Sensation" without involving drone.
Meet legendary Cactus Warrior.
Survive the great underground arena.
Save Toby from drowning.
Beat up the underground monster.
Finish "Mercantile Gap" with a spare key.
Collect your first golden coin.
Find private Ian and brick him back to Sergeant Depper.
Defend Survive without losing a single defender.
You're not alone anymore.
Get out of the underground.
Figure out who's behind all this mess.
Save the messenger from trouble and bring back Sir Walkalot.
Complete the most difficult puzzle in the game.
Defend Von Drake and the Knights without loosing a single defender.
Complete at one side quest.
Complete introduction levels without loosing a single life point.
Complete 8 levels without unlocking perks once you receive first skill point.
Unlock your first perk.
Find the easter egg.
Hit the roach with pistol shot from large distance.
Finish the cat with a wrench hit.
Build your first gadget with gloves on.
Crush at least 4 types of hostile creatures by pushing box at them.
Exterminate 50 roaches.
Hit somebody with reflected projectile executed by Rowdy.
Launch hostile creature into the water.
Survive the bomb explosion.
Explode two or more creature with the bomb.
Consume 42 pieces of cheese.
Finish level while being poisoned.
Jump over a creature.
Launch hostile creature into a trap.
Complete a level without recovering lost health.
Collect 10 hearts.
Injure 12 knights without knocking them out!
Complete 7 levels without receiving injuries.
This is achievement for the cat. He actually did it!
Skip a level.
Become a victim of your own actions.
Find a secret place.