Step 1)You'll need a dump of the playerdata.def
Step 2)Ctrl + F and search for "round" it's a struct that contains the gamemode stat offsets
Step 3)Take note of round = 3392
Step 4)Go down with the arrow in the ctrl + f search window and you'll see stats such as assists, deaths, defends, etc all within the "round" struct
Step 5)Add the stat you want to the offset for round(3392) so score would be 3392 + 12 = 3404 or 0xD4C if you convert it back to hexadecimal, so stat entry + 0xD4C would be score for gamemode leaderboards

Step 1)You'll need a dump of the playerdata.def
Step 2)Ctrl + F and search for "round" and go down until you see "s5 round;"
Step 3)Take note of the "offset: 0xBF" and that round is within struct s23
Step 4)Ctrl + f search for "s23" and use the arrows until you see "offset: 0x87A0"
Step 5)Ctrl + f search for "s5" and you'll see "struct s5 //totalsize = 208" and you'll see the gamemode stat within the struct
Step 6)Find the stat you want and add everything up, so for score you'd have 0x87A0 + 0xBF + 0x36 = 0x8895, so stat entry + 0x8895 would be score for gamemode leaderboards

Step 1)You'll need a dump of the playerdata.def
Step 2)Ctrl + F and search for s22 and take note of "offset: 0x7440"
Step 3)Ctrl + F and search for aliensession or s18 and go down until you see "offset: 0x234"
Step 4)go back up to the original struct for s18 it should say "struct s18 //totalsize = 154" and you'll see the stats for extinction leaderboards located within
Step 5)Locate the stat you want and add everything up, so for score you'd have 0x7440 + 0x234 + 0x8 = 0x767C, so stat entry + 0x767C would be score for extinction leaderboards

Step 1)Use this playerdata.def to figure AW out yourself based on the tutorials I gave for the other games