Here is the full list of all 31 Aron's Adventure achievements.
Grow up
Equip a Sentinel set with a certain bow
Finish your adventure
Rest at a campfire
End a fight at the old baron's castle
Acquire your castle
Complete the mayor questline
Climb to the highest point in the game
Swim for the first time
Unlock all skills and upgrades
Who needs this much anyway?
Own 10,000 gold
Learn from the wise old teachers
Meet Phanne
Purchase a squared surprise
Liberate all camps and bases near Rive
Liberate all camps and bases in the Meadows
Liberate all camps and bases around Shadow's Edge
Melt your way through the cold prison
Find a way through the abandoned mines
Make it through the library
Perform a stealth takedown
Defeat your first troll
Defeat the dragon
Defeat the wyvern
Defeat the witch
Find out the secrets of the eyes
Recruit the cultists
Complete the Golsa questline
Sit on a special chair on a mountain
Loot every chest in a certain hall