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