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