Level 22

Total Experience Required 61,404

Level 100 progress: 0.9%

This is roughly the same as:

Killing 103 people in Warzone, or...
Killing 105 people in Execution, or...
Killing 87 people in Wingman, or...
Scoring 21,930 points in Guardian, or...
Scoring 66,744 points in Annex, or...
Scoring 40,398 points in Submission.

Horde (TU4)

Completing 154 waves on Casual, or...
Completing 103 waves on Normal, or...
Completing 77 waves on Hardcore, or...
Completing 62 waves on Insane.

Or a combination of the above. Have fun!