Here is the full list of all 15 Alpha Particle achievements worth 1,000 gamerscore.
Destroy 50 Crystal Elements.
Destroy 100 Crystal Elements.
Destroy 200 Crystal Elements.
Accumulate 1,000 Banked Energy.
Accumulate 2,500 Banked Energy.
Accumulate 5,000 Banked Energy.
Upgrade your Core to 50 Max Energy.
Upgrade your Core to 60 Max Energy.
Upgrade your Core to 70 Max Energy.
Own 1 Particle.
Own 2 Particles.
Own 3 Particles.
Die 15 times.
Die 30 times.
Die 60 times.