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