Here is the full list of all 35 One Step From Eden achievements.
Have over 200 cardtridges in your deck
Kill a hostage with the Devour spell
Have 8 pacts at the same time
Beat Serif and get sent back
Win a boss fight with 1 HP
Execute Terrable
Cast 10 Jams in one battle
Kill Gunner or Shiso with a Slashfik spell
Defeat tier 4 Hazel
Reach the Gate
Defeat tier 4 Saffron
Have 1 Spell in your deck
Spare Terrable
Defeat tier 4 Shiso
Get a Calamity spell
Defeat tier 4 Gunner
Defeat tier 4 Terra
Defeat tier 4 Reva
Defeat tier 4 Selicy
Defeat tier 4 Violette
Destroy a Self Defense hazard
Have over 9,999 Shield
Have a spell from every Focus in your deck
Beat the game without taking any spells
Beat Hell Mode 14
Cover the entire field in flames
Beat the game with every character
Kill the last enemy with the Fadeaway spell
Beat the game without collecting any Artifacts
Win a battle without using a Spell or Weapon
Have 0 Max Mana
Upgrade the same spell 4 times
Have at least 16 broken tiles at the same time
Defeat tier 4 Shopkeeper
Execute Serif