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