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