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