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.
Hope you're hungry.
Complete 50 levels with only one Soda Junkie.
Find a legendary item.
Complete dungeon level 1000.
Complete 100% of the bestiary.
Complete dungeon level 750.
Reflect 100 damage from a single attack.
Complete dungeon level 500.
Purchase all basic sodas.
Sell 100 items.
Complete dungeon level 250.
Complete 100 levels in one trip.
Find a rare item.
Have one Knight defend for another Knight.
Steal essence from an enemy.
Complete dungeon level 100.
Inflict burn, sleep, poison, and confusion on one enemy.
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.