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.
Kill and loot 10 flying animals (crows and gulls).
Complete all conversations with the Endurance crew.
Incapacitate 25 enemies with dodge counter.
Shoot a bundle of dynamite out of the air.
Revive a teammate in a multiplayer match.
Shoot 10 enemies off zip lines.
Kill a zip-lining enemy player in multiplayer.
Survive 10 explosions in multiplayer.
Find all documents, relics and GPS caches.
Complete the game.
Fully mod and completely upgrade all weapons.
Purchase all skills in all categories.
Complete all challenges.
Complete all optional tombs.
Fully mod and completely upgrade any weapon.
Find 75% of all documents.
Perform 15 finishers.
Collect 75% of all relics.
Find 75% of GPS caches.
Kill 20 enemy players in multiplayer using a turret.
Kill 10 multiplayer enemies using your melee attack.
Kill FeeFee the crab.
Purchase all skills in one category.
Complete one challenge.
Kill 40 enemies with the shotgun.
Catch a player in a snare trap in multiplayer.
Kill 2 multiplayer enemies with a single explosive.
Rope pull 5 enemies off edges.
Complete a match in all multiplayer modes.
Win a ranked match in every multiplayer mode.
Kill 75 enemies with the rifle.
Kill and loot 10 large animals (deer, boar, wolves).
Loot 200 enemies.
Collect 5000 pieces of salvage.
Force an enemy to drop dynamite that kills two people when exploding.
Kill 25 unaware enemies.
Kill 50 enemies with the bow.
Find 25% of GPS caches.
Kill 35 enemies with the pistol.
Kill and loot 10 small animals (rabbits, chickens, rats).
Perform 50 headshot kills in the single player campaign.
Collect 25% of all relics.
Find 25% of all documents.
Complete one optional tomb.
In multiplayer, escape death 3 times by using the rope ascender.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
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.