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