Here is the full list of all 25 Abomi Nation achievements.
Discover every area in a map
Beat the optional Temporal Boss
Raise one stat to +6 in a Permadeath battle
Win the Abomi Quiz minigame
Use a Fire-type move while underwater
Win the Whack-a-Moile minigame
Win the Abomi Racin' minigame
Buy something from the Temporal Store
Evolve an Abomi with an Evolution Crystal
KO 100 Abomis
Survive on 1HP in a Permadeath battle
Beat your first boss and gain a Mysterious Piece
Recruit your first Abomi
Reach maximum Bond between two Abomis and make them Partners
Change an Abomi's colour using a Palette or Grayscale Orb
Revive an Abomi through a code
Fill the Global Abomi Archive
Spend 50,000 Shiny Pebbles across all runs
Buy 50 things from the Temporal Store
Deal over 100 damage to an Abomi in one hit
KO an opponent in one hit with your Basic Attack
KO 1,000 Abomis
Beat the game
Beat the game on Brutal with Permadeath on
Finish a Custom Game