Here is the full list of all 13 Space Jam: A New Legacy - there are The Game achievements worth 1,000 gamerscore.
Defeated White Mamba
Defeated The Brow
Played Space Jam: A New Legacy - The Game with some friends
Pass the ball at least 30 times in a level in multiplayer
Hit 3 enemies with a single charged ball
Juggle an enemy 5 times
Achieve 999999 points in a single playthrough
Complete Space Jam: A New Legacy - The Game
Complete the Boss Rush Mode
Play through Space Jam: A New Legacy - The Game without continuing
Discover all the Space Jam Cards
Activate every Space Jam Card effect
Beat Space Jam: A New Legacy - The Game on Hard Mode