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