I somehow got the achievement with Gill Grunt. I used his Power hose along with the Neptune Gun with all upgrades on that path. Then I held the (X) button for the hose whilst pressing (A) for the Neptune Gun ability to work it made some of the phases incredibly short. In fact you could put the 'bonus artifacts' like Healing Elixer, Ghost Swords and Time Twister and it didn't void it. So the more supplies the better. Anyway thanks for the Terrafin suggestion but tried him with Razorfin and failed, Gill Grunt got it for me. Thanks for the advice. Catching up on other games now.