Here is the full list of all 14 Tunnel VR achievements.
Played with all 3 songs to max speed
Get 10.000 points on easy
Get 50.000 points on easy
Get 100.000 points on easy
Fly backwards
Collect 100 Pickups over any number of games
Get 30.000 points on normal
Get 150.000 points on normal
Get 300000 points on normal
Squeeze through the smallest gap
Hold max speed on hard for 10 seconds
Get 50.000 points on hard
Get 250.000 points on hard
Get 500.000 points on hard