Here is the full list of all 18 Telltale Games' Poker Night 2 achievements worth 400 gamerscore.
Unlocked the Portal theme.
You've unlocked every poker item in the game.
You've won a million dollars.
Unlocked the Army of Darkness theme.
You won a Personality Core. Try not to drop it down the incinerator.
Unlocked the Venture Bros theme.
Unlocked the Sam & Max theme.
Unlocked the Borderlands theme.
Sam's banjo is now yours.
Are you now Character of the Year?
Purchased a felt.
You now own the scariest book in history.
Bought your first deck.
The Orb is yours, for better or for worse.
Purchased a drink.
Purchased a set of chips.
Won a tournament.
Won a hand.