Level 92

Total Experience Required 5,287,216

Level 100 progress: 77.46%

This is roughly the same as:

Killing 8,813 people in Warzone, or...
Killing 8,992 people in Execution, or...
Killing 7,468 people in Wingman, or...
Scoring 1,888,292 points in Guardian, or...
Scoring 5,746,974 points in Annex, or...
Scoring 3,478,432 points in Submission.

Horde (TU4)

Completing 13,219 waves on Casual, or...
Completing 8,813 waves on Normal, or...
Completing 6,610 waves on Hardcore, or...
Completing 5,288 waves on Insane.

Or a combination of the above. Have fun!