Here is the full list of all 50 Tomb Raider achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Fully mod and completely upgrade all weapons.
Complete all challenges.
Complete all conversations with the Endurance crew.
Kill 40 enemies with the shotgun.
Incapacitate 25 enemies with dodge counter.
Force an enemy to drop dynamite that kills two people when exploding.
Shoot 10 enemies off zip lines.
Shoot a bundle of dynamite out of the air.
Kill 75 enemies with the rifle.
Rope pull 5 enemies off edges.
Kill and loot 10 flying animals (crows and gulls).
Kill and loot 10 small animals (rabbits, chickens, rats).
Reach level 60 in multiplayer.
In multiplayer, be the only player on your team that isn't dead or downed.
Buy every upgrade and character in multiplayer.
Purchase a new multiplayer character.
Reach level 10 in multiplayer.
In multiplayer, escape death 3 times by using the rope ascender.
Kill 2 multiplayer enemies with a single explosive.
Kill 10 multiplayer enemies using your melee attack.
Win a ranked match in every multiplayer mode.
Revive a teammate in a multiplayer match.
Survive 10 explosions in multiplayer.
Catch a player in a snare trap in multiplayer.
Kill a zip-lining enemy player in multiplayer.
Complete a match in all multiplayer modes.
Kill 20 enemy players in multiplayer using a turret.
Find all documents, relics and GPS caches.
Complete the game.
Purchase all skills in all categories.
Fully mod and completely upgrade any weapon.
Complete all optional tombs.
Find 75% of GPS caches.
Find 75% of all documents.
Collect 75% of all relics.
Kill FeeFee the crab.
Purchase all skills in one category.
Loot 200 enemies.
Collect 5000 pieces of salvage.
Kill 50 enemies with the bow.
Kill 35 enemies with the pistol.
Collect 25% of all relics.
Find 25% of GPS caches.
Perform 50 headshot kills in the single player campaign.
Kill 25 unaware enemies.
Perform 15 finishers.
Find 25% of all documents.
Complete one challenge.
Complete one optional tomb.
Kill and loot 10 large animals (deer, boar, wolves).