How to Survive
12 Achievements
400
15-20h
Perfect run
Complete a challenge with a "S" ranking.
45
How to unlock the Perfect run achievement in How to Survive - Definitive Guide
For starters, play the storyline for a while, don't try to dive right into this. The controls and mechanics in this game take some getting used to, and this is definitely not the place to learn them.
Ok, all good? Alright, do a practice run first. You start in different locations each time you play the challenge (unless you die and hit retry), but the plane is always in the same spot and the map is always the same. So, since speed is fairly important for the S ranking, you're going to need to learn the map. It's not terribly hard to learn, but there are some blocked off paths that you should know about.
So, you know how to play and where to go? Great! One more thing. There are two spawn points: one on the west side with bow materials, and one on the east side with gun materials. The gun makes this MUCH easier, but if you're good with a bow, you can play it out if you get that one.
Beyond that, it's a simple achievement and the requirements aren't too harsh. Kill all the zombies from your spawn point to the destination, including the bosses... but no need to go out of your way. Avoid damage as much as possible and try to move as fast as possible - you don't have to speed-run it, but you don't want to screw around either. My final time was 14 minutes and change when I got the S ranking with a 91% accuracy, 160 kills, and 120'ish% damage taken.
Also note that this can be done in co-op mode. I personally found it easier to do solo, as both player's stats are combined for the final ranking. If you have a good partner, by all means, give it a shot.
Ranks in challenges are based off several criteria: Accuracy, Health Damage, Zombies Killed, Time Taken. In order to achieve an S Rank, you must complete a challenge relatively quickly, killing most of the zombies with very high accuracy, with little to no damage. Unfortunately, the exact requirements for these criteria to meet an S Rank aren't given to you.
Getting S Rank can be difficult on some challenges, but I personally found Challenge 6 to be the easiest. At the start you'll receive enough component to make either a Precision Rifle, Wooden Long Bow Pulley or Wooden Crossbow (Kenji only), all of which can pierce enemies and kill multiple at once. If you're using Kenji as recommended for Story Mode, you should be able to make the Wooden Crossbow, which is the best of the available weapons. With this, you can clear out all enemies with ease by going for headshots and lining them up. You can avoid the bunker in the forest, as the extra zombie kills from that aren't necessary for S Rank. The only concern is the boss at the end, though you can just run past him to the plane and still get S Rank.
It's really quite simple. The task is to find the plane. The location and location of the plane are the same every time. Only your starting point changes. Study the map, get used to the controls, and then try to kill as many zombies as possible (including bosses) during the passage, take virtually no damage and do not delay the completion for dozens of hours.
I saw similar statistics on one site - 14 minutes, accuracy 91%, 160 kills, health lost 120% - rank S.