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