[Challenges - General] A Unique Collection
[Challenges - General] A Rare Phenomenon
[Challenges - General] Champion's Collection
[Hardcore - General] Trophy Hunting
[Hardcore - General] We are the Champions
The other two I need: Light Entertainment and The One Percent are simply time consuming and I am almost finished with them anyways. However, with regards to the five I mentioned, I am aware that there are certain glitched enemies that cannot appear in the game until they are fixed. One example is the Fallen Cur Champion Pack which can no longer appear since they were removed from The Ancient Path. Another example is the Champion Subjugator Pack which does not award the player with credit for slaying them upon slaying them. I think there also may be some Uniques no one has found but I am unsure.
Any word on when these will achievements will become... well... achievable!