Level 59

Total Experience Required 1,113,834

Level 100 progress: 16.32%

This is roughly the same as:

Killing 1,857 people in Warzone, or...
Killing 1,895 people in Execution, or...
Killing 1,574 people in Wingman, or...
Scoring 397,798 points in Guardian, or...
Scoring 1,210,690 points in Annex, or...
Scoring 732,786 points in Submission.

Horde (TU4)

Completing 2,785 waves on Casual, or...
Completing 1,857 waves on Normal, or...
Completing 1,393 waves on Hardcore, or...
Completing 1,114 waves on Insane.

Or a combination of the above. Have fun!