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