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