Here is the full list of all 34 Nimbatus - there are The Space Drone Constructor achievements.
Completely destroy a planet
Construct a drone with over 500 parts
Construct a drone with over 100 parts
Construct a drone with over 250 parts
Own over 1000 Unobtainium in any mode
Own over 5000 Tritium in any mode
Lose your first drone in the survival mode
Complete all tutorials
Reach an angular velocity of 2000°/s with your drone
Construct your first drone
Win 10 matches in a row in the sumo tournament
Win 10 matches in a row in the brawl tournament
Initiate the self destruction sequence of your drone core
Kill the snake boss in the ancient jungle ruin
Win a versus race tournament
Win a catch tournament
Complete the survival mode on normal difficulty or higher
Complete the survival mode with the Heavyweight captain
Complete the survival mode with the Pilot captain
Complete the survival mode with the Miner captain
Complete the survival mode with the Engineer captain
Complete the survival mode with the Researcher captain
Complete the survival mode with the Programmer captain
Find a planet filled with resources
Reach Galaxy #10 in any mode
Upload a drone to the Steam Workshop
Reach a velocity of 450m/s with your drone
Print a factory part with a factory part
Have over 100 logic parts in a drone
Complete a mission without using thrusters
Kill 10 bees by ramming into them
Drop 5 Bio barrels at the same time into the Nimbatus container
Freeze a bee and drop it off at the Nimbatus container
Destroy a Corp laboratory without disabling it's shield