Level 30

Total Experience Required 131,771 [confirmed]

Level 100 progress: 1.93%

This is roughly:
Killing 440 people in Warzone, or...
Killing 449 people in Execution, or...
Killing 373 people in Wingman, or...
Scoring 94,123 points in Guardian, or...
Scoring 286,459 points in Annex, or...
Scoring 173,383 points in Submission.

Horde (TU4)

Completing 659 waves on Casual, or...
Completing 440 waves on Normal, or...
Completing 330 waves on Hardcore, or...
Completing 264 waves on Insane.

Or a combination of the above. Have fun!