Here is the full list of all 26 Beat Blitz achievements.
Beat Phantom with an S+ ranking!
Beat Gamma with an S+ ranking!
Beat Ultramarine with an S+ ranking!
Beat Infrared with an S+ ranking!
Beat Shimmer with an S+ ranking!
Beat Vector with an S+ ranking!
Beat Glitch with an S+ ranking!
Beat Sphynx with an S+ ranking!
Beat Primer with an S+ ranking!
Beat Ultraviolet with an S+ ranking!
Beat Frolic with an S+ ranking!
Beat Apex with an S+ ranking!
Earn an S+ on Primer with the Flip Avatar!
Earn an S+ on Sphynx with the Flip Avatar!
Earn an S+ on Glitch with the Flip Avatar!
Earn an S+ on Vector with the Flip Avatar!
Earn an S+ on Shimmer with the Flip Avatar!
Earn an S+ on Infrared with the Flip Avatar!
Earn an S+ on Ultramarine with the Flip Avatar!
Earn an S+ on Ultraviolet with the Flip Avatar!
Earn an S+ on Gamma with the Flip Avatar!
Earn an S+ on Phantom with the Flip Avatar!
Earn an S+ on Frolic with the Flip Avatar!
Earn an S+ on Apex with the Flip Avatar!
Beat every level with an S+ ranking!
Earn an S+ on every level with the Flip Avatar!