Little did I know before trying for this achievement, that actually
stealing a Wraith is hard as hell! Personally, this was the first time I'd needed to board and steal one and I found it really difficult. I've put together a video in which I finally and successfully manage to actually steal the first one I came across in Mission 5.
Dependant on what situation you're in once the closest checkpoint kicks in before the Wraith spawns, trying to steal the Wraith can be very awkward. Take down all the enemies in the area first of all, and wipe out the huge Covenant spaceship Cortana advices you to target which is flying over the water asking to be nailed by the Mammoth's massive cannon. Shortly after this, the Wraith tank is dropped in.
You may need to take out your friendlies if they have brought out the Warthog from the Mammoth as a lot of time, they can be a bit too efficient with the Warthog's turret, even in a 1 v 1 situation against the Wraith. Once it's down to just you and the Wraith in the area, your first job here is to take out the enemy who is exposed in the Wraith using the turret. The Sniper is the best weapon for this and can be found on the Mammoth near the two turrets on its top. I tried to scavenge the battlefield for one of the Covenant Plasma Pistols which you can fire a burst of Plasma at enemy vehicles and temporarily disable them. Unfortunately for me, these weapons were no where to be seen.
Once the Plasma Cannon operator is taken out, you need to gently land on the Tank's small plasma cannon itself and occupy this space. Simply getting within range of the tank and pressing
to board won't do the trick here as there's no way to actually hijack the Wraith from this position. Once the turret is taken over, the driver of the tank will get out. Take him out quickly, get back out of the tank and then get back into the main driver's seat.
Moving onwards with the Mammoth, a deadly river lies up ahead in which the Mammoth will use it's vehicles ramps and main body to serve as a bridge for your vehicle. I'm not sure if the Wraith can go through this river on its own but when I tried this with Warthog's and Ghost, it didn't work. Fitting the Wraith into the Mammoth itself can be really awkward but it
does go in, eventually. Once out on the other side, your first (of four) enemy Wraiths will be waiting for you near the third generator you need to destroy. The other three spawn near the "unidentified covenant vehicle" that spawns later on in the mission.
Please note that if you do manage to steal the Wraith, and it's not in top condition, dying in the vehicle respawns it with full health for some reason. I only found this out during my try for this achievement, so with this knowledge, don't be afraid to wreak havoc on the enemy once you acquire the Wraith.
Please note: I didn't notice this the first time round, but there's actually a Plasma Pistol you can pick up in one of the caves around this area. Charge up a shot with the pistol and fire at the Wraith to disable it for a few seconds allowing you to get some easy shots in against the Plasma Cannon operator. Once he's dealt with, fire another shot to give you a chance at boarding the Wraith easily and forcing the other Elite to get out. (Cheers
Tomblyboo117)
Check out this video for more help and guidance on this achievement: