Here is the full list of all 24 Soda Dungeon achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Complete 100% of the bestiary.
Find a legendary item.
Win a battle by only defending.
Reflect 100 damage from a single attack.
Inflict burn, sleep, poison, and confusion on one enemy.
Complete dungeon level 750.
Complete dungeon level 1000.
Complete dungeon level 500.
Complete 50 levels with only one Soda Junkie.
Steal essence from an enemy.
Sell 100 items.
Complete 100 levels in one trip.
Hope you're hungry.
Complete dungeon level 250.
Purchase all basic sodas.
Find a rare item.
Have one Knight defend for another Knight.
Complete dungeon level 100.
Enter a battle in the Arena.
Slay 500 enemies.
Complete 50% of the bestiary.
Slay 10 bosses.
Discover and explore an alternate path in the dungeon.
Complete your first dungeon trip.