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