"Wreacking Locust Vengeance" achievement not unlocking

[Shulamm]

Hi guys. For this achievement you need to get one kill for each type of locust in beast mode. It happens to me (and I've seen I'm not the only one in an achievement forum) that the only one left I need to get the achievement is the TICKER. Not the wild one, but the regular exploding one. And I've killed a good amount of cogs with the ticker...

Could anyone tell me what I'm doing wrong? Or if this achievement is bugged?

Thank you for reply.

[Ereaser]

I have no idea, but I killed lots of ppl with the ticker and yesterday when I killed someone with it it just suddenly said on the bottom right my progress towards the achievement. So I guess it counted.

[Shulamm]

It finally unlocked. It's a matter of keep playing. But I can assure you that I've killed like 15 people or so with a ticker (in different matches) until it unlocked.