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