Here is the full list of all 12 NBA Unrivaled achievements worth 200 gamerscore.
Win 10 ranked match games
Win the challenge ladder with one team
Win any game with a buzzer beater shot
Score 3 back to back 3 pointers
Make 10 shots back to back
Complete an alley-oop dunk
Post a triple double (at least 10 points, 10 rebounds, 10 assists) with one player
Be #1 on any challenge leaderboard
Score a 3 in momentum
Win a game with at least double your opponent's score
Win by 10 or more
Complete 10 dunks in one game