Here is the full list of all 12 Mithos achievements.
Play the game.
Save Kampupot from the asong gubat.
Defeat your first boss.
Slay a Bungisngis.
Unlock All 4 maps.
Slay an Ikugan.
Unlock all fast travel locations in Hirangbanwa.
Hatch 5 mysterious eggs.
Finish the game.