There are Eight Assignments for the Final Stand DLC, there are as listed below:
--------------------------------------------------------------------------------------------------------------
Disinformation
-Affect 10 Enemies with M84 Flash bang
-3 Melee Kills
The M84 is available as soon as you download the DLC, you'll need to hit the enemy with "hitmarkers" to get the credit.
--------------------------------------------------------------------------------------------------------------
Eye Spy
-2 Spotting Ribbons
-20 DMR or Carbine Kills
This is all very easy, use a DMR or Carbine and get 20 kills. (Doesn't need to be in one round) For spotting ribbons, you'll need to get 4 Spot Bonuses to get one ribbon. This is very easy using the MAV, but if you don't have one, just spot everything you can and can't see all the time. You'll have these two ribbons in no time.
--------------------------------------------------------------------------------------------------------------
XD-1 Deathbringer
-30 Kills using XD-1 Accipiter
-3km Travelled using the XD-1 Accipiter
The travel 3km is the easy part here. Just be patient and remember to spot your enemy to make killing them easier. Getting up close and personal doesn't hurt either, just be careful and you may want to strafe because it doesn't take much to take the XD-1 Accipiter out of the sky!
--------------------------------------------------------------------------------------------------------------
Snowmobile Slayer
-10 Snowmobile Roadkills
-5 minutes airtime on a Snowmobile
Whiteout is my favorite for this one, as traveling anywhere on that map on the Snowmobile means that you're almost always going to be in the air.
Now, the road kills, can be frustrating if this is something that you're going for by itself. I would recommend trying to get these while you're working on other assignments so that you're not focusing on how few kills per game you're getting.
NOTE - Invite a friend to die 10 times and consider the job done!!
--------------------------------------------------------------------------------------------------------------
Hovertank Harbinger
-15 Vehicles destroyed in the HT-95 Levkov
-10 minutes in the HT-95 Levkov
This is pretty easy, and I would recommend Hammerhead. Get in the Hover Tank and use cover to your advantage. Don't waste shots and before you know it you'll have your 10 minutes and 15 vehicles destroyed.
NOTE - Just because someone hops off/out of their vehicle doesn't mean that you don't get a vehicle destroy. DESTROY ALL OF THE VEHICLES!!! Just make sure that either an enemy is on/in the vehicle, or that the enemy was JUST in/on the vehicle.
--------------------------------------------------------------------------------------------------------------
Railgun Rampage
-10 Vehicle Kills with the Rorsch Mk-1
-25 Kills with the Rorche Mk-1
This pickup weapon is a blast! Pick it up, and blast away, for the sake of time stick to the smaller vehicles. Snowmobiles, quads, Little Birds, etc. You'll have this one done before you know it.
--------------------------------------------------------------------------------------------------------------
Mechanical Mayhem
-25 kills with the Schipunov 42
-5 mins in the air with the launch pod
The Launch Pod - Go to Hanger 21, I prefer the F Flag on Conquest Large. Shoot it straight up in the air and after you land get back in and do it again. After a match or two, you should have this done. I did mine for about 5-10 rides and then I went and grabbed the Railgun and worked on that so I wasn't just using the Launch Pod the whole time.
The Schipunov 42 - This thing is not the best turret I've used, but my best results came on Whiteout using the B Flag on Conquest Large. I aimed it mostly at the B Flag itself where the hover tank spawns. I got most of my kills in the building and some of them from infantry coming over the hill, etc. Just keep an eye on your radar and be mindful of what flags are captured, this should tell you what direction the enemy will be coming from.
--------------------------------------------------------------------------------------------------------------
Frostbite
-Play 10 hours on Final Stand Maps
-Win 10 Rounds on Hanger 21
-Win 10 Rounds on Operation Whiteout
-Win 10 Rounds on Giants of Karelia
-Win 10 Rounds on Hammerhead
The 10 Hours of Play will come faster than the wins. However, the best way for me to pile up wins was invite my friends to a full squad and play TDM. The matches were fast so far. I've only done about 10 total TDMs, but they were the fasted matches/wins that I've played so far.
Credit to Darth Chimp on the True Achievements website. I copied his guide and then used all of the ways that I accomplished my goals.