|The Necklace||Topa Topper and her Middlemen|
Silent Sage - Complete mission without using a Sage Ability. - 2000 Plex.
3720 to 1 - Complete mission without colliding with any asteroids. - 2000 Plex.
The Photocaster Cannon Nero wanted you to equip in the last mission will work well with your Ace Drive, since it's a laser ability and thus can be improved by Ace.
Lore note: Solarians are another name for humans in the Ring Runner universe.