Gears of War: Judgment

All Aboard - Win Hardcore Survival on Terminal with 5 Soldiers.

This achievement is pure hell. Just did it on my third attempt. First attempt I got to Wave 9, second attempt my Xbox crashed when we were on Wave 9

So you'll need a team of 5 and do this on Hardcore difficulty. EVERYONE has to be a Soldier in order to unlock this. Ideally practice with the Booshka will help you survive this.

In order to have a real chance of getting this achievement, you must survive the first 4 waves before the first E-hole is taken.

We moved two Coles to the right of E-hole 1 and held the Locust at the entrance as long as possible, one with Booshka, one with Lancer. The other 3 people held the other side with 2 Booshkas and a Lancer. Try to stick to cover as much as you can.
The first 5 waves pass quickly and it's the Tickers and Wretches that cause the most problems.

E-Hole 2 - This is effectively your Slaughterhouse, we got to Wave 10 before the Locust finally took our E-hole. Station 3 Coles on the left, firing down the Arcade, whilst 2 Coles defend the right, one of them MUST remain on the turret, the second can hide around the corner ahead of the turret and fire/spot enemies for the gunner.

Using the gun turret is essential for your success. You can gun down incoming enemies on the right AND support your team on the left if the Locust reach the blue laser fences.
Also the majority of the Locust ignore the turret as they're trying to get to the E-Hole, I think I only died once from a Corpser who wanted to destroy me, but other than that, nothing attacked me.

E-Hole 3 - This is a final DESPERATE last stand for your forces. If you're on Wave 10 here, you should do this. Hold the outer fortification line for as long as you can but don't be afraid to retreat, if a barrier's gonna go, just retreat to fight again.
When the enemy get to the Red laser fortifications, get one player on the turret. Gunning down enemies to the right is easy but impossible to the left.

So 4 Coles focus fire on the Locust attempting to break the left laser fence, while the gunner guns down everything that advances to the right laser fence. If the worst does happen and the left fence falls, the Locust will mindlessly charge the Generator, enabling you to mow them down as a Gunner. Other players, ensure that you don't get in the gunner's line of fire.

Good Luck... you're gonna need it. :)

Ok,Hooded Claw 006's solution above is very good so take what he says & add these tips which really seemed to help us out.

Obviously you want to hold Hole 1 as long as possible,on our successful attempt wave 6 is when we got pushed back.We had 2 on right/3 left pretty much spamming Booshkas constantly from cover to where the 1st fences are.If a wretch/ticker gets past,call it out,good comms is a must.

Now hole 2-this is where my main tip comes in very handy.For some reason if the host mans the Troika turret on the right & the other 4 players go left to cover the arcade,the locusts seem to take no interest in the guy on the turret.I got knocked off it once by a wretch's scream.I could easily take care of the right side & provide cover to the arcade side when needed,although the 4 guys on that side did a wicked job.We finished the match with maybe 30% of the e-hole left,never got near the generator! I'd been on the turret in a previous session,not as host,& got a lot more attention from the grubs.

I would recommend if you're not halfway through wave 8 & you're already at the generator,quit & restart.Its really not worth wasting the time on the tiny chance you'll hold the generator for 2 & a half waves.If you make it to Wave 9 then have to fallback to the generator,that's great,& wave 10 is even better,almost guaranteed success,barring some huge cock-up.

Thanks to Bushee Brow for the tip about the Host being the guy on the turret,it really makes a big difference.I hope it helps somebody else's group too.

Good luck!