1-10 level achivement not unlocking

I beat level 1-10 (Lizard King), while playing offline, so I did not got the achivement. Later, I played the same level and still no achivement unlocked. Is it bugged?

 

I also beat F1 of Inifinity, but I got that achivement after beating F8 while online. So this seems specific to the Lizard King boss, so far.

happened to me too at 10-10 final battle , i cant get that achievement even if i play to level again and again , maybe we need a quick fix for this

It happened again 2-10, but, I got both achivements after playing 3-2

 

Weird, I know. But it seems they are all over the place. Keep playing and I hope you get them soon.