
@PGI: Alright, here is my after action report:
I failed all five categories. My primary deck had no mediums so that is one.
Light units failed to get any solo kills and managed to get exactly (20/20) assists.
Heavy units failed to achieve enough kills (7/15) and solo kills (1/3) with total of 103 assists.

Assault units likewise failed, with (5/20), (1/4) and total of 58 assists.
Then to fifth challenge:
Scouting was by random chance silly easy, first match was a crushing win over the clanners.
Siege: Several wins (5/1), a couple of them even really easy.
Conquest: Lots of games, clans won them ALL.
Domination: Some games, clans won them ALL.
Assault / skirmish: Not sure which, one game, one loss.
Incursion: ZERO games.

End conclusion: The class based challenges are challenging for a tier 5 bottom of the barrel like me... but the FP game mode challenge was total bust. In addition to the forum complaints I both read and heard numerous complaints. What is even more borked is the fact that different people were missing completely different games. At least one person managed to fail by missing conquest (no tries available), which I got a lot. Also, despite how massively over common siege was, at least one clan player only got his first and only siege just before time went out and he lost the match.

Very, very serious request, already echoed by many: Please do not make challenges impossible for many people to finish with RNGed access to even trying, thank you. Asking for say... Seven FP wins in any mode or 1 scouting + 6 of any, would have meant that I would have still failed, but a lot of people would have been very happy with that.