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