Level 94

Total Experience Required 5,660,466 [confirmed]

Level 100 progress: 82.93%

This is roughly:
Killing 18,869 people in Warzone, or...
Killing 19,254 people in Execution, or...
Killing 15,991 people in Wingman, or...
Scoring 4,043,191 points in Guardian, or...
Scoring 12,305,361 points in Annex, or...
Scoring 7,447,982 points in Submission.

Horde (TU4)

Completing 28,303 waves on Casual, or...
Completing 18,869 waves on Normal, or...
Completing 14,152 waves on Hardcore, or...
Completing 11,321 waves on Insane.

Or a combination of the above. Have fun!