Here is the full list of all 26 Ampersat achievements.
Gain all Perks
Return all Lost Items
Gain 3rd Ring Bonus Perk
Gain 2nd Ring Bonus Perk
Beat the Well's 100th level
Fill the Bestiary
Open the Portal to Lord Z
Capture all Bonus Words
Defeat all Dungeons
Fully Upgrade Armor Shop
Make the Gem Merchant appear
Fully Upgrade Freya's Statue
Fully Upgrade Skadi's Statue
Fully Upgrade Well
Gain 1st Ring Bonus Perk
Fully Upgrade Weapon Shop
Defeat a Tower
Fully Upgrade Inn
Sniff out all Secret Chests
Defeat a Dungeon
Open the Well
Find a Secret Chest
Consult the Bestiary
Gain a Rank
Capture a Bonus Word
Ostensibly read the "How To"