Here is the full list of all 13 NBA 2K Playgrounds 2 achievements.
Score 20 Double Alley-Oops
Score 20 Self Alley-Oops
Buy 25 packs of any kind
Win the season for the first time
Reach Playoffs in the season mode for the first time
Improve one legendary player to Gold level
Suit up a player with 1 vanity item
Buy 1 pack of any kind
Activate Hot Streak by scoring 4 consecutive shots
Win the NBA Season with 1 team from each conference
Reach user level 50
Score 33 or more points in a single round of a 3 point contest
Win the NBA Season on NBA difficulty