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