Here is the full list of all 46 Pixelot achievements.
Upgrade an item to +3
Reach Level 20
Deal 200 critical hits
Collect the Earth Crystal
Reach Level 10
Complete the Ranger's Trial
Protect 20 Allies in combat
Defeat the leaders of the mercenary band
Collect 10 Heroes
Collect the Shadow Crystal
Escape from the sewers
Heal 5000 Damage
Collect 100 Items
Defeat 500 Monsters
Defeat 40 Unique Monsters
Reach level 30
Pass the Sage's Trial
Restore Myria to its rightful ruler
Collect 10,000 Gold
Reach level 40
Defeat the Tower King in the Dark Tower
Reach level 50
Reach Level 60
Reach level 70
Reach level 80
Reach level 90
Reach level 100
Collect the Water Crystal
Collect the Storm Crystal
Upgrade items 20 times
Confront the Orgo Chief
Explore Mt. Magmor
Deal 1000 Damage with 1 attack
Clear Arena Challenges
Promote 10 Units
Defeat Prisma
Defeat 20 Bosses
Complete 10 Quests
Confront the Great Yeti
Collect the Light Crystal
Traverse the Hidden Grotto
Collect the Fire Crystal
Defeat the Dark Lord
Clear the Labyrinth
Collect the 6 Legendary Weapons
Defeat Prisma II