As I see it, It says SCORE: 2500 I'm thinking those are "Your TrueSkill points"
Here's my Theory Note that this in SPARTAN OPS, and not on WAR GAMES.
Complete Game: Seem pretty obvious, you complete the game, you get points, you quit, you loose points.
Victory: You win, get points, you loose, you loose points.
Score: Things you do to prove your skill in-game Ex. Headshot, Sniper Kill, Nade Kill, Assist, Assassination etc.
Online: I think this only applies for Spartan Ops, which you can play online and solo offline. You play online, you get some extra points.
Objectives: This also applies only for Spartan Ops. You complete certain amount of objectives given for the mission, you get points, you don't, you loose points.
Also, remember these are ONLY 1000 or so points, and you need 140'000. Takin extra zeros off, its like you win 1 point and you need 140