The other solutions perfectly give away that there is a positive glitch, though I didn't find those guides complete enough, which resulted in me and my boosting partner Healtti
having to do 2 classes instead of just 1.
The achievement requires you to purchase 4 different active skills across 4 different characters. Active skills are the tier 4 skills. Each class (Brawn, brain, fighter and survivor) has one active skill which you can unlock. You can only spend 20 DNA points on one character. Tier 1 skills are worth 1 DNA, tier 2 are worth 2 DNA, and so on. In order to purchase tier 2 skills, you will need to have purchased at least 1 tier 1 skill. The same goes for Tier 3 and tier 4 skills, you need to have purchased at least 1 skill from the tier below that. Besides, you will need to have spend 10 DNA points on skills for the same class, in order to unlock the ability to purchase the tier 4 skill. Last but not least, you need experience points.
Tier 1 skills cost 1500, tier 2 cost 2250, tier 3 cost 3500 and tier 4 cost 5000.
The positive glitch is that, if you have both:
- created 4 different characters, one with a brawn skill as background skill, one brain, one fighter and one survivor
- purchased the active skill for the survivor
it'll unlock the achievement.
This basically decreases the time needed for this achievement by 75%. So, to start off, create 4 different characters, each with a background skill from a different class. You will be using the character with the background skill in Survivor. You will need to purchase at least one tier 2 and one tier 3 skill. This will cost 3500+2250=5750. This will get you to 6 DNA points. Purchase two more tier 2 skills to reach 10 DNA points. (10250 xp). Finally, you will need 5000 xp to purchase the tier 4 skill (15250 xp). Be sure to only purchase survivor skills. Besides, remember that you can only have 20 DNA points for one character. If you have a character with 6 or more DNA points in different classes, start using a new one.
We would average about 1200-1300 xp (with small xp boosters) in about 6-7 minutes (including loading times) by using the boosting method below. This means, that you can get this achievement in about 12-14 games, and in under 2 hours. Boosting method
The boosting method we used was replaying the level "enemy at the gates" on easy. This is in my opinion the easiest and fastest level. At the start of the mission, you will need to hack 2 computers at 2 locations. We would always split up. Use the hacking charges or explosives on vehicles (or shoot the yellow bar at the back of the vehicle). Only kill enemies and vehicles that you really need to kill in order to be able to hack the computers. More kills doesn't really give you a lot more XP.
Once both computers in locations are hacked, start running east. You will run underneath a highway. If you go to far to the east, it'll say "go back to the mission". You can move further North or South, depending on what location you came from. The team leader will say something like "I'm sending you the new location, where you can get a bike". Once she is almost finished with this monologue, you can leave the mission area and head for the bike stash. Get on the bikes and race straight for the location of the 10 elite KPA soldiers. There, start killing those elite soldiers, along with any other dudes that attack you. Once there are just 2-3 elites left, let one player leave for the extraction area (you will need to have played the mission at least once to know the location). Once the other player(s) have killed the remaining elites, let them down themselves. The player at the extraction area enters the final room and the mission is finished. We were able to finish this mission in about 5 minutes, with our best time being something like 4 minutes and thirty seconds. Cash/Weapons
I've used the first battle rifle all the time, with the first secondary weapon (pistol). I had it unlocked from the start. Spend your cash on either attachment upgrades (1000 dollar) ( to try and get Grip, red dot and muzzle brake attachments) or on consumable upgrades (500 dollar). I would advise to spend most of your cash on the latter. You will replenish your hacking charges (which I used a lot), you get weapon parts (to upgrade your weapons with) and you get xp boosts (use these whenever you have them).
I had a lot of progress on this achievement by doing this mission:
This mission is in my opinion also best suited to get:
Depending on the skill of your teammates, you might get this achievement (otherwise, just boost it at a vehicle, or keep jumping from a rooftop):
You will definitely get the following achievements, without specifically going for these, in 3-4 games:
After you've gotten your achievement, play one more game with your character. Then hold
to throw down some supplies. Let one of your teammates pick those up for your final achievement in resistance mode.