This was already a problem in alpha, but somewhat insignificant along the way of other, way more grindy unlocks.
Being a problem that there were very few missions with side quests to count towards the skill tree unlock (Suppression Skill Tree).
Now, off the few side quests I have seen so far, which seem to b even fewer, FAR FEWER than in alpha,
only a fraction counted towards that "achievement".
It is not an incredibly important skill tree, but somewhat useful, and it should be unlock-able without getting "self flagellation" twice on the way.