Here is the full list of all 27 Lock's Quest achievements.
Destroy 5000 Clockworks
Complete the game without dying
Complete the game in Hard mode
Finish the game with exactly 0 source
Repair 100 unique walls
Complete 10 waves of Antonia Defense
Use all 4 of Lock's special attacks in a single battle
Destroy 1 of each type of Elite Clockwork
Destroy 1 of each type of Silver Clockwork
Use 1 of each Turret, Trap and Helper in a single battle
Destroy 1 of each type of Bronze Clockwork
Have enemies activate 1 of each trap type during a single battle
Complete all the Swamp maps
Unlock all the Turrets, Traps and Helpers
Defeat all 7 Clockwork bosses
Destroy 200 Elite Clockworks
Unlock all of Lock's Super Abilities.
Complete all the Beach maps
Destroy 200 Silver ClockWorks
Find Emi
Complete all the Forest maps
Defeat Beast without losing a wall
Complete all the Mountain maps
Accumulate 100,000 Source
Kill 10 Clockworks in 10 seconds
Destroy 200 Bronze Clockworks
Lose Emi