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