Here is the full list of all 40 Indie Game Battle achievements.
Win a match as Jarvis.
Win a match as Artist.
Win a match as Electroman.
Win a match as Gip.
Win a match as Woodle Tree.
Win a match as Adventure Pals.
Win a match as Poncho.
Win a match as The Kid.
Win a match as Max & STEVE.
Win a match as Red Drop.
Win a match as Huey.
Win a match as NoLegs.
Win a match as Chip.
Win a match as Salad Fingers.
Win a match as Bingo.
Win a match as Zee Tee.
Win a match as Wizard.
Win a match as Rex.
Get 10 total KOs!
Win a match as Matt.
Win a match as Aria.
Win your first Survival match.
Win a match as Blue Blob.
Launch the game for the first time.
Get 100 total KOs.
Get 500 total KOs.
Get 1000 total KOs.
Get 5000 total KOs.
Get 10000 total KOs.
Get 50000 total KOs.
Get 99999 total KOs. Wow, you deserve a cookie for this one.
Win a match as Captain Viridian.
Win a match as Pico.
Win a match as Cal.
Win a match as Dust.
Win a match as Gontaper.
Win a match as Goat.
Win a match as Teslakid.
Win a match as Sol.
Play a match in Turbo Mode.