Engineer specialist

Challenge 2 does not work:
- 13262 damage done to aircrafts - including kills- assist - suicides by enemy
- Used Track- Untrack  - Track - untrack - track - untrack - TRICK -> DOES NOT WORK (Challenge track)
- 2 Kills - 4 Assists DOES NOT COUNT - Also include suicides

Have also tried
- AA shoulder launcher
- AA TANK
- PAINTED LAUNCHER

none of these count towards this challenge. So you need to use knife to complete this or what ? be more specific.

When do you fix challenges as playables ?