Here is the full list of all 40 XIII achievements.
Find all collectible items.
Obtain all achievements.
Stab 15 enemies from behind without being noticed.
Eliminate 3 or more enemies with one grenade.
Destory the armor of a fully armored enemy, then kill him with a melee attack.
Complete the Sanctuary cliff section in under 3 minutes.
Find all the documents.
Find 15 documents.
Kill 4 enemies at once with the Bazooka.
Find 10 documents.
Empty the Revolver using the alternative fire mode without missing any shots.
Eliminate 15 enemies with a headshot in one level.
Eliminate 6 enemies with one magazine of the Revolver.
Complete a level without being damaged.
Make it through a level without shooting anyone.
Complete the campaign on easy difficulty.
Complete the campaign on medium difficulty.
Complete the campaign on the highest difficulty.
Find 5 documents.
Eliminate 5 enemies with your fists in a row.
Eliminate 20 enemies with improvised weapons.
Find the secret entrance to the Sanctuary.
Have XIII drown.
Die more than 25 times.
Swings from a grappling hookc to another 3 times without touching the floor.
Escape the Canyons on a jet.
Find your first document.
Eliminate 5 enemies in a row with a headshot with the Dragunov.
Unlock 15 doors.
Get full armor.
Get 20 pieces of armor.
Eliminate 5 enemies in a row without alerting them.
Find a way into Emerald Base.
Eliminate 10 enemies without getting hurt.
Destroy a punching bag.
Find 10 medkits.
Kill an enemy with the last bullet of the revolver.
Crash everything at the beach house.
Find your first collectable item.
Reach the truck in Brighton Beach.