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