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