Here is the full list of all 34 I am weapon: Revival achievements.
Meet the Firefly
Buy best armor
Collect 100 adrenaline mixes
Complete the game
Complete the game in co-op mode
Complete the game at Nightmare difficulty
Find all prototypes on six levels
Complete a side quest
Find all prototypes
Collect 300000 souls
Kill 200 burning enemies with a sword
Kill 25 enemies in 2 seconds
Kill 2000 enemies by means of other enemies
Kill 200 frozen enemies with an axe
Kill 10000 enemies with a long-range weapon
Use every long-range weapon
Kill 3000 enemies with a chainsaw
Kill 10000 enemies with a melee weapon
Start the game in co-op mode
Open all safes
Join three players in co-op mode
Spend 900 000 souls
Max out an ability "Get max hearts"
Use all active abilities
Complete all the side quests
Complete Chief's quest
Help the Madman and Criminal
Complete Pirate's quest
Solve the shadow puzzle
Cross the Swamp of Illusions
Walk through the Isles of Memories
Cross the Desert of Lost Time
Walk through the Eternal Ice
Use 100 hearts