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