Unable to unlock "Shell-Shocked" Achievement

[gamefalcon]

I've beaten 1 advanced mission 3 times with only cannon towers (Heights of Confusion) and another one once (Roundabout). The Shell-Shocked achievement will not unlock. I've only got a few achievements left and this one is my next one. Help! Am I not able to sell towers?

[jeff]

I'll ask the engineers about selling.* I'm not sure.* Some achievements don't allow selling, but I didn't think that was one of them.





Any mission from Out of Fuel onward is an "advanced mission" so that should be enough.





Jeff

[DiamondKnight19]

I just completed Barrier to Entry's Story & Story Challenge with only cannons.
The achievement did not unlock.