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