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