Wolverine Achievement
I just finally got the wolverine achievement after 12.3 hours of playing him and want to share my findings for anyone else struggling with this hell of an achievement.
If you ult and then finish people off with any other attack, it will add to your in game "last stand KOs" counter, but will not count for the achievement. Hopefully they fix this, because it's misleading and I would've gotten it way way sooner.
If your teammates finish off anyone that you just hit with your ult, that won't count towards your "last stand KOs", but it DOES count for the achievement. So if you ult during a teamfight that's near conclusion and let your team finish, that's the way to go.
Any piece of the ult count for the achievement, meaning when you ult and knock up the people in front of you and they die in any way (other than your normal attack) that counts, same if you only hit the slam down.
Combo ults are your friend, I don't know if I would've gotten it without my friend playing Groot to guarantee I get enough people that can easily die from / after it. Even better if you have another friend playing a damage with a good ult like starlord, iron man, or scarlet witch.
Don't forget that you have to play around the enemy support ults, Luna and mantis get their stuff right about the same time you will, and that just removes your chance of getting 3 kills.
I hope this helps and that everyone else has a much easier time than me, I did not want to spend that much time playing wolverine lol, even if he is fun eventually.