Level 93

Total Experience Required 5,472,913

Level 100 progress: 80.18%

This is roughly the same as:

Killing 9,122 people in Warzone, or...
Killing 9,308 people in Execution, or...
Killing 7,731 people in Wingman, or...
Scoring 1,954,612 points in Guardian, or...
Scoring 5,948,819 points in Annex, or...
Scoring 3,600,601 points in Submission.

Horde (TU4)

Completing 13,683 waves on Casual, or...
Completing 9,122 waves on Normal, or...
Completing 6,842 waves on Hardcore, or...
Completing 5,473 waves on Insane.

Or a combination of the above. Have fun!