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