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