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