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