I'd say they might be pretty straightforward actually.
3 blocks, 3 steals and 3 offensive rebounds are not as easy as they sound, in fact I'd argue they're hardest stats to get.
So in PS4 terminology I'd say they'd be:
- Bronze: 3 blocks/off rebounds/steals, 5 assists/free throws/threes, 10 points
- Silver: 5 blocks/off rebounds/steals, 10 assists/free throws/threes, 20 points, 10 def rebounds
- Gold: 50 points, 20 def rebounds, 15 threes, 15 assists
GAME_TAKEOVER is activate takeover in 2K19
GAME_STARTER_ALL_SCORE_DOUBLE_DIGITS sounds very straightforward
MISC_COACHING_ADJUSTMENT is making the "on the fly adjustments" from previous years
Some others sure are new...
GAME_GREEN_ZONE ... maybe green several shots from one zone?
GAME_EASY_GREEN ... maybe green while wide open (green release with green defense?)
Finally, the "UNIMPLEMENTED" might be just hidden for MyCareer stuff or yet to be added. At the same time adding new ones shouldn't be extra hard so the ones I noted missing might make a comeback still.