Here is the full list of all 38 Reflex achievements.
The journey for revenge begins
Socket 100 components
Socket 250 components
Socket 500 components
Remove 100 components
Remove 200 components
Take down 20 laser fences
Have at least 8 missiles at the same time
Adjust rotatable components 100 times
Increase missile to maximum speed
Insert first component in a locked socket in any world except on the Training Station
Have a missile attempt to use a holder component while another missile is already being held
Take out 10 laser turrets
Destroy 20 temporary power generators
Dislodge 20 floor panels
Dislodge 40 floor panels
Open an optional weapon crate
Destroy 20 breakable walls
Use more than 500 missiles
Complete a level with no built components left behind
Complete all training levels with 3 star rankings
Socket 1000 components
Deconstruct 750 components
Use a Holder 100 times
Travel Through 100 Portals