Wrecking Ball achievement "Spare" doesn't award

[Machu]

So I had a green build, keeping wrecking ball in my backpack as it is otherwise useless, I think I was using boy's axe and a shield. Later, I opened a chest, which was a trap which fills the room with like 30 enemies. That's when I realized "Ahah! A perfect time to get the wrecking ball achievement!" So I run to one side of the room, switched my backpacked wrecking ball in, ran and rolled to the other side of the room to kite bats and zombies, then started the combo. The 1st two swings may have killed 4-6 enemies, but the 3rd and 4th hits where you throw the ball then pull it back most definitely positively killed over 6 enemies. So... why no achievement? What do I need to do? I want to stop using this terrible weapon!

(And it's not like I'm using any setting that disables achievements. No aspects, not custom mode. I think the only assist mode options I use is highlighted secrets and continues. I believe it was on 4 boss stem cells.)

[KAIIRU]

Having the same issue. I've cleared rooms covered in enemies several times with both the swing and return of it and no achieve. It's the only one weapon related achieve I'm missing besides the cursed sword that I haven't unlocked yet.

[gbors]

Copied from a similar thread:

The trouble with this achievement is that only direct kills count, collaterals don't. So if your wrecking ball has an arrow or bomb affix, and the arrow / bomb kills an enemy when the ball is thrown, then that kill doesn't count against the 5. If the ball doesn't quite kill it but then a following dot effect (like fire) does, it may seem like a valid kill but it doesn't count against the 5 either.
i did it in the Ossuary, looked for a place with two Spawners close together, let them squirt 3-3 Corpse Juices (or Corpses Juice? :D ), and went for it. Still it was only the third or fourth attempt that worked.

[Machu]

Originally posted by gbors:

Copied from a similar thread:

The trouble with this achievement is that only direct kills count, collaterals don't. So if your wrecking ball has an arrow or bomb affix, and the arrow / bomb kills an enemy when the ball is thrown, then that kill doesn't count against the 5. If the ball doesn't quite kill it but then a following dot effect (like fire) does, it may seem like a valid kill but it doesn't count against the 5 either.
i did it in the Ossuary, looked for a place with two Spawners close together, let them squirt 3-3 Corpse Juices (or Corpses Juice? :D ), and went for it. Still it was only the third or fourth attempt that worked.

Alright, I did your Ossuary strategy and it seems to have worked. The corpse juice enemies are slow enough to kite then combo without getting hit.

My guess, which someone mentioned in that other thread you replied to, is that getting hit during the combo interrupts the count. Which is weird for a green weapon that always has "Cannot be interrupted by an enemy's attack". If this is true, I still think it's a bug.

[gbors]

Originally posted by Machu:

Which is weird for a green weapon that always has "Cannot be interrupted by an enemy's attack". If this is true, I still think it's a bug.

I'm not sure about the mechanics of the "cannot be interrupted" feature - I had situations where such an attack was interrupted, with several weapons. So I've kind of disregarded it for a long while now :)