What you were expecting to happen, and what actually happened:
Mixology achievement in Steam seems to not work? Tried every troop that creates potion and still 0/100.
How often does this happen? When did it begin happening? Every time
Can confirm, same thing here. Just did an explore 12 run with Maelstrom Dago and Thrall.
4-casts of Dagonath * 13 potion gems (brown astral spire), 6 fights.
Even with overwritten potion gems, that should be WAY more than 100, yet steam says 0.