Lost Items Achievement was stolen

[Gewittertier]

When the game was released, I played it and got all 12 achievements.

Today, I wanted to start another run and took the first lost item (the truck).

Now my achievement for finding all lost items was removed from my Steam account. Didn't even thought this was possible!

So now it's 11/12 and I have to find them again.

Just saying, I don't know if this is intended.

[Gewittertier]

Played the game once again and again I collected all lost items.

But I didn't get the achievement back.

Is there any way to get it?

Just wanted to enjoy a game once again... and lost my 100%.

[Gewittertier]

Got it back... Just saw it said "6/7". Nevertheless, I got all lost items before.

Restarted the sewers via chapter select and got the first item again. Then it popped.

Btw: Game got really better since release :)