Warning: Poor English and this achievement is time consuming (About 1-1.5 hours)

• Survival is a game mode that a group of 6 people struggle together and survive as long as you can. (If it is a server with official settings)
  
• You can only respawn when half of your surviving teammate reach the objective (safe house).
  
• The higher level you reach, the more enemies with better equipment you faces.
  
• If you reach a safe house, you will get 2 supply points, if you didn’t reach it but you survived, you will get 1 supply point, if you are the one waiting to respawn, you will get no supply point.
  
• You strat with 2 supply point. Maximum supply points is 20.

In survival, you can choose Militant(Leader), Specialist, Fighter, Sapper, Sharpshooter, Machine Gunner, Scout, Bomber. Without Striker and Sniper which means you will never able to have MLG noscoper with a scoped rifle and RPG-7 (but you can take the enemy At-4)

In survival, the cost for all weapon has beed changed, most attachment didn't at all.
Sidearm is free, suppressor cost only 1 supply point (only Specialist and Scout have it)

Take Bomber as an example:
Mosin cost 1 supply point (basic weapon for all classes), TOZ cost 2 while MP40 cost 3
Grenade cost 3 instead of 2


And these are the explosive that Fighter can have

Enemy info.

• Light/no armor
  
• Pistol/SMG
  
• AT-4
  
• Only very little enemy will have rifles

You will start with makarov and flashlight attached, but I prefer to use M9 with flashlight plus light armor

• M9 have a much larger magazine(15 rounds) compairing with makarov(8 rounds) and
  M1911 (7 rounds).
  
• More rounds = less reload = survival chance increase
  
• With armor = more health = survival chance increase

Depending on your playstyle, you can choose to save more supply point for a heavy armor or upgrade your weapon first. Some people like to use mosin at the very early stage of the game, but remember not to be a camper, it's useless for not caping the safe house.

Enemy info.

• Mainly light armor, with little heavy armor
  
• SMG/rifle
  
• AT-4
  
• Some enemy will have silenced SMGs/rifles

You should have at least a primary weapon starting from level 7 (non mosin), you can take that from enemy too, also, M1911 is much more useful now when enemies start to have heavy armor.
He is the one who with take the enemy's weapons :) Good example

Enemy info.

• Mainly heavy armor, with only few light armor
  
• Mainly silenced SMGs/rifles
  
• AT-4
  
• M249
  
• Few enemy will still using SMGs/rifles

You should have build up your loadout for at least 70% after Level 14-16.
Weapon with Ap ammo is recommended.
This is my loadout as Specialist:

Enemy info.

• Heavy armor
  
• Mainly silenced SMGs/rifles
  
• AT-4
  
• M249
  
• Very very very few enemy will still using SMGs/rifles
  
• Zombies like (number)
  
  You should already fully loaded and prepare for endless level of survival untill your team is done.
  Just like this =.=
  

I would recommend District
No matter where you spawn, go find Alpha, Bravo, Charlie or Echo
These four points can form a loop
Which means B->A->E->C and back to B
With many in-door area and cover, it is easier for player to train.

It is important that to stay with groups, or at least 2 people, more guns, more firepower, survival chance increase. Simple.

Some may think that " Oh, I got a NVG, why I still need a flashlight?"
How NVG works is actually amplifying the light sources in the dark, but not total darkness.
Have you ever encounter problems likes wearing a NVG but still not able to see in some very dark area?
I shows you the example

See the differences?

In survival, camping is usually not a wise choice, because Security has unlimited number but your team only have 6. Stick with your teammate and push together would gain more supply points that you could have a better performance.
Unless you are the last guy left and the enemy usually surrounded the safe house you just rushed to.

Hope this guide is useful to you guys and
Hope everyone could get this achievement :)
Good luck
If you got any problem, plz feel free to leave a comment and I will reply as soon as I can :)