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