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