Level 80

Total Experience Required 3,305,374

Level 100 progress: 48.42%

This is roughly the same as:

Killing 5,509 people in Warzone, or...
Killing 5,622 people in Execution, or...
Killing 4,669 people in Wingman, or...
Scoring 1,180,491 points in Guardian, or...
Scoring 3,592,798 points in Annex, or...
Scoring 2,174,589 points in Submission.

Horde (TU4)

Completing 8,264 waves on Casual, or...
Completing 5,509 waves on Normal, or...
Completing 4,132 waves on Hardcore, or...
Completing 3,306 waves on Insane.

Or a combination of the above. Have fun!