Here is the full list of all 26 Obludia achievements.
Die 50 times
Fire 100 Shotgun Shells
Cast 50x Ring of Fire spell
Slay 30 Ghosts.
Cast 50x Glacial Spike spell
Cast 50x Lightning Strike spell
Slay 20 Devils.
Complete World 5 – Space Ship
Use 10x Holy Cross.
Destroy 50 Alien eggs
Slay 100 monsters with blade.
Complete World 4 – Hell Gate
Save 10 princess.
Buy your first dog.
Throw 50 dynamites.
Complete World 3 – Frozen Island
Complete World 2 – Ancient Tower
Find 20 chest.
Eat 20 Hamburger.
Find 1000 Coins.
Find the legendary golden monkey statue
Slay 20 chickens.
Complete World 1 – Dungeon of Doom
Slay your first enemy.
Complete the game on HARD mode.
Complete the game.