Here is the full list of all 42 World of Guns: Gun Disassembly achievements.
Complete 'Operate' mode
Complete 'Assembly' mode
Complete 'Disassembly' mode
Complete 'Field Strip' mode
Unlock any three gun models
Complete the tutorial to earn achievement
Complete all seven game modes for at least one gun.
Complete Game mode without using hints
Complete Game mode hitting only parts which can be activated
Unlock any ten gun models
Unlock all gun models
Unlock all models in Artillery category
Unlock all models in Assault Rifles category
Unlock all models in Grenade/Rocket Launchers category
Unlock all models in Historical category
Unlock all models in Machineguns category
Unlock all models in Pistols category
Unlock all models in Pocket Guns category
Unlock all models in Revolvers category
Unlock all models in Rifles category
Unlock all models in Shotguns category
Unlock all models in Sporting Guns category
Unlock all models in Submachine Guns category
Unlock all models in World War II category
Unlock all models in Skeletons bonus category
Unlock all models in Cars bonus category
Unlock all models in Bikes bonus category
Take one of Top-3 places of day best results in Game, Super Game or Hardcore Game of any model (gun or bonus).
Become day champion in Game, Super Game or Hardcore Game of any model (gun or bonus).
Complete Super-Game mode for any gun
Perform all Special Operation tasks and got the prize
Complete Quizz mini-game with 10 models
Complete all task on any Shooting Range
Unlock all Shooting Ranges
Complete 'Game' mode
Earn all achievements for any gun
Complete 'Hardcore Game' mode
Complete Game or Super Game without hasty clicks
Complete Super game with accelerating al least 75% parts
Complete Daily Puzzle during 30 days
Complete Daily Puzzle during 60 days
Complete Daily Puzzle during 90 days