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