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