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