Here is the full list of all 18 Drones achievements.
Clear Wave 10 of Cell Block 14C on Wave Mode
Clear Wave 15 of Power Plant on Wave Mode
Clear Wave 20 of Basement Level 6 on Wave Mode
Clear Wave 25 of the Core on Wave Mode
Defeat the Overseer in Dimension 11 on Wave Mode
Purchase 1 Upgrade from the Store
Max Out an Upgrade Category in the Store.
Purchase Every Available Upgrade From the Store
Make $1000 or More in a Single Game
Score 1,000,000 Points in a Single Game
Defeat 1000 Thralls
Defeat 500 Saboteurs
Defeat 500 Standard Units
Defeat 250 Tank Units
Defeat 100 Elite Units
Defeat a Probe That is Ready to Explode
Defeat a Warden Before it Sounds the Alarm
Find a Cash Crate and Pick it Up