Akshamala is a synonym of Rudraksha. Aksha means which never destroyed which is one of name of god rudra (god shiva). And it derived rudrasha mala and it is produced from god shiva eyes. The aksha also mean eye.

rudraksha trees produced from god shiva eyes (Rudraksha Collection)

Once upon a time, When lord shiva was doing long meditation and when he suddenly open his eyes. The holy tears form a mystical rudraksha tree.

So we should not be confused as aksha mala with rudraksha mala

We can find same word AKSHA in Rudraksha and AkshaMala.