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