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