Level 94

Total Experience Required 5,660,466

Level 100 progress: 82.93%

This is roughly the same as:

Killing 9,435 people in Warzone, or...
Killing 9,627 people in Execution, or...
Killing 7,996 people in Wingman, or...
Scoring 2,021,596 points in Guardian, or...
Scoring 6,152,681 points in Annex, or...
Scoring 3,723,991 points in Submission.

Horde (TU4)

Completing 14,152 waves on Casual, or...
Completing 9,435 waves on Normal, or...
Completing 7,076 waves on Hardcore, or...
Completing 5,661 waves on Insane.

Or a combination of the above. Have fun!