Here is the full list of all 40 METALLIC CHILD achievements.
Repair Schrodinger 20 times.
Open Daviny's box 20 times.
Be graded a D for battle 100 times.
Rescue 20 survivors.
Defeat 20 of Catherine's modified robots.
Perform 200 Chain-skill attacks.
Help retrieve Sly's weapons 20 times.
Accomplish 100 triple kills.
Install 200 bugged and viral Cores.
Change weapons 100 times during battle.
Help deliver Trevon's virus case 20 times.
Collect all Recor-Ds.
Equip a drone 100 times during battle.
Go on camera 20 times, for Miamo's live stream.
Accomplish 30 combos.
Accomplish 30 fantastic kills.
Collect all Fan-art.
Defeat 3000 enemies.
Install 150 Super-cores.
Defeat the Metallic Child, Magna.
Defeat all Metallic Childs.
Defeat the Metallic Child, Flyer.
Perform 200 Take-downs.
Defeat the Metallic Child, Lighton.
Clear Terminal Creed.
Defeat the Metallic Child, Spyden.
Defeat the Metallic Child, Shutty.
Clear all Virtual Missions.
Defeat the Metallic Child, Controd.
Deal 600 damage or more to an enemy in a single hit.
Defeat the Metallic Child, Icela.
Defeat the Metallic Child, Faceless.
Accomplish = double kills.
Install 150 Mini-cores.
Defeat the Metallic Child, Gigantic.
Be graded an S for battle 100 times.
Defeat the Metallic Child, Graver.
Experience a defeat in battle.
Visit the various facilities of Life Stream.
Defeat the Metallic Child, Fira.