Unable to get "Gunslinger"/"Fire in the hole" achievements

[NMi]

I have chosen the starting S200_0:Waternaris to get these achievements (I have completed this map before, if it matters).
The only weapons I build are the Cannons (Mortars for the FITH achievement). I do not build other weapons (except Nullifiers, of course), I do not even activate the AoO, the only non-weapon objects I build are Collectors, Reactors and the Forge.
Still those achievements don't appear. Where did I go wrong?

[Karsten75]

Waternaris is in Tormented  Space, not Prospector Zone.

[NMi]

Oh [censored]. Thought it was some kind of stupid thing that I've done. Thanks!