Here is the full list of all 20 Thibalryn achievements.
Aquired the normal bomb.
Aquired the zero g-force bomb.
Aquired the anti-gravity bomb.
Aquired the multi-bomb ability.
Reached 10% total completion.
Reached 20% total completion.
Reached 50% total completion.
Reached 100% total completion.
Increase your maximum health.
Found a helmet.
Found some boots.
Found some leggings.
Found a chestplate.
Found the golden helmet.
Defeated the boss of Stage 1.
Defeated the boss of Stage 2.
Defeated the boss of Stage 3.
Defeated the boss of Stage 4.
Defeated the boss of Stage 5.
Proved you really are the best.