Frostwolf Perfection

Well since this is a HORDE achievement, i would hope it is a HORDE tactic.

I just did this Achievement with a Premade.
Setup :
Group 1-6 : Just random
Group 7-8 : Rogue + Druids

Tactic :
Group 1-6 : Defend galv in the first minutes of the game. After that split up ( Group 1-2 hang between IB tower and IB gy, Group 3-4 stay at galv, Group 5-6 recap FW and other towers )
Group 7 : First grab IW bunker, stay there till its destroyed. After that go DB South Bunker
Group 8 : Frist grab SH bunker, stay there till its destroyed. After that go DB North Bunker

We did it in one try.
This tactic is for the HORDE.

Vaughul - Al'Akir EU

this is imposible with random players in 85 lvl

Not really; after a few days of attempts I queued with a friend of mine today (38 people random), we got a fail-alliance group (saying this because we managed to beat them even where we were outnumbered) and a good horde group, for once willing to listen, also.

Usual tactic, defended at galvangar at start; after a few alliance wipes, 1-2 of us always kept an eye on galvangar while a few groups were going to take back our towers\graveyards; a few went north to take bunkers and defended them till actually we got them.

They tried to come again to galvangar when they had lost all of their towers, so we formed a big group and wiped them again; we had like 520 reinforcements when alliance had around 100, we were temped to go kill balinda, but feared they might have killed galvangar fast (not even 4 millions hp), so we didn't risk, and kept farming them in the field of strife.

They probably tried to ruin our achievement, assaulting Tower Point when they had around 15 reinforcements, because if we hadn't defended it before they reached 0, we'd have failed.

The game ended around 500 to 0 reinforcements, so the answer is: "Yes, this achievement is still possible at 85 in random groups, just need the right circumstances and a few people reporting incoming assaults".