Here is the full list of all 12 Lazerball achievements.
Play your first match!
Select all DJs in a single game
Play a 3 Player game
Play a 6 Player game
Play an 8 Player game
K.O 3 players in under 10 seconds as Marksman
Score over 50 points in a Points game
Play as every character in a single game
Invite a friend to play via Steam Remote Play Together