Level 92

Total Experience Required 5,287,216

Level 100 progress: 77.46%

This is roughly the same as:

Killing 17,625 people in Warzone, or...
Killing 17,984 people in Execution, or...
Killing 14,936 people in Wingman, or...
Scoring 3,776,583 points in Guardian, or...
Scoring 11,493,948 points in Annex, or...
Scoring 6,956,864 points in Submission.

Horde (TU4)

Completing 26,437 waves on Casual, or...
Completing 17,625 waves on Normal, or...
Completing 13,219 waves on Hardcore, or...
Completing 10,575 waves on Insane.

Or a combination of the above. Have fun!