Age Of Wonders 4

Ironclads are unlocked with the material tome “dreadnaut” and once you have one you can get this achievement. The ammo types are once-per battle abilities that change the properties of the next shot taken by the unit

Just a minor note that it doesn’t have to be the same ironclad that uses every ammo type. I got this on turn two with two dreads, making sure I used different ammo every time.