Here is the full list of all 15 Constant C trophies - there are 9 bronze and 6 silver.
Chase Ellie 2.0 through all the levels where she appears.
Change the direction of gravity in the midair at least 10 times and land safely.
Exceed 150 deaths.
While free-falling at a high speed, change the direction of gravity and apply brakes.
Complete story mode.
Gather all the storage devices.
Find the dinosaur.
Discover the phone-microwave.
Reach the storage device location in D3-3 and complete the level without dying.
Collect any storage device inside the 6th door without using the second time field.
Complete C2-2 in 5 seconds.
Complete C3-3 in 5 seconds.
Complete C3-4 in 7 seconds.
Complete F1-5 in 20 seconds.
Complete D1-5 without falling off the ball unnecessarily.