Got the last endless achi without that big of a hazzle, it was just about RNG with sha's (several tries with 0 crits, gg)
Just used DoC and FoN, stayed in solar for all eternity until first sha (went to lunar for it for double starfall+better single target). Once it died went back to solar and stayed there until last sha where i used everything (CA and zerg buff)
didnt really bother with gear, just took some tier helm token that i had in bank and traded it just to get working meta (not enough bank space to save all gears)
All in all, this shit reminded me of levelin, tabdottabdottabdot....-.-