-Estimated achievement difficulty: 3
-Offline: 50 [1000
-Online: 0 [0
-Approximate amount of time to 1000: 26 hours total (20 hours campaign, 6 hours co-op)
-Minimum number of playthroughs needed: 1
-Missable achievements: Unheard , Fully Inked
-Does difficulty affect achievements?: No
-Glitched achievements: People are reporting issues with the Co-op achievements popping. I have not had any problem personally on 2 accounts. Make sure you play through each chapter from the start menu to completion each time.
-Unobtainable achievements: None
Playthrough #1: This is an open world game so you can do what you want when you want. 1000ing this game will still leave a LOT of world left to explore.
Co-Op Campaign: Play through the Co-op story mode either online or local for those 6 achievements.
Aftermarket Junkie - 20 Buy all attachments and paint jobs for one weapon.
The opening pistol, the 1911, is a required buy at $60 at the start of the game. It has no attachments so you only need to buy 6 camos at $200 each for a total of $1200 for the achievements to unlock.
Artsy Craftsy - 10 Craft 5 upgrades for your equipment.
You can get this for crafting the pouches and items you need to hold items. You will need to look up a recipe in the Crafting menu to see what hides you need. Then look at the map and look for the icon that equals that animal. Go to that area and hunt down the animal. You can use the camera to mark them for easier tracking. The achievement will pop as soon as you craft your fifth item.
Heartless Pyro - 10 Kill 50 enemies with the flamethrower (Single Player only).
The Flamethrower costs $2400 and it is under Specials in the store. I would recommend spending the $250 on the larger fuel tank expansion. Be careful with the flamethrower as you can easily light yourself on fire.
Improper Use - 5 Kill an enemy with the Repair Tool (Single Player only).
The Repair Tool costs $400 and it is under Specials in the store. Then use it on an enemy. It will light them on fire and they will eventually die.
Money to Burn - 15 Spend $5000 at the shop.
This is cumulative. You do NOT need to save it all up and spend it once. As soon as you've spent a total of $5000 it will unlock.
Needle Exchange - 15 Craft 25 syringes.
Syringes are made in the Crafting Menu using plant materials you have found in the world. The plants all show up on the mini-map and re-spawn when you leave and re-enter an area so making and using 25 syringes is VERY simple.
The Good Stuff - 15 Craft a special syringe.
For this you must first collect 30 Relics. These show up as white vases on the map. Once you have 30 you will unlock a new category under Syringes called Specials. The first one, Untouchable, costs 5 green, 5 blue, and 2 white. Craft it for the achievement.
Toxophilite - 10 Kill a target from 70m or more with the bow (Single Player only).
The Recurve Bow costs $925 and it is under Specials in the store. I would suggest doing this on a Outpost or Wanted enemy. If you set a waypoint via the map on the enemies location then you will see your distance to target in the bottom left of the main HUD.
Love the Boom - 10 Kill 4 enemies simultaneously with one explosion (Single Player only).
Easiest way to do this is to go to a Outpost and let them trigger the alarm. This will bring reinforcements in cars. Wait for one with 4 people in it and BOOM, achievement is unlocked.
(TIP CREDIT: PONYPO2001) If you have problems unlocking this with the RPG some people have had success with grenades.
Rock Always Wins - 10 Fully distract 25 enemies with rocks (Single Player only).
You throw rocks by pressing Right on the D-Pad. The enemy must not be currently in an alarmed state. You can also NOT kill them. You need to throw the rock, let them investigate, and then fully reset. That counts as 1. You can do this 25 times in a row.
Island Paparazzi - 15 Tag 25 enemies using the camera (Single Player only).
You bring out the camera by pressing up on the D-Pad. Then you will see skulls above the NPCs to show you have tagged them. Just pull it out whenever you get to a Outpost or WANTED Dead quest and it will unlock very quickly.
Rebel With a Cause - 10 Liberate 3 outposts.
To "Liberate" an Outpost is to simply go in and kill all the enemies. Once everyone is dead, the flag will change and it will move to your possession. Doing so unlocks new quests in the area.
Island Liberator - 40 Liberate all outposts.
There are a total of 34 Outposts.
Unheard - 20 Liberate an outpost without triggering an alarm.
The opening mission Outpost does not count so head to any other Outpost on the map. Getting the Bow or a Silencer for a weapon will greatly help on this achievement. Most of the Outposts are VERY small. 4 or 5 enemies tops.