From the Depths achievements

Get a unit that provides the maximum strategic radar range in a campaign

Use more than 15 RTGs on a vehicle you've made yourself. Unlocked in designer.

Build a 1 million damage explosive combo in the campaigns/missions/adventures of built in planets (using standard game constants)

Score 5 battle merits in a single (preset difficulty) campaign battle. You'll need to attack a force approximately 10 times your volume and win with 60% of your volume undestroyed to achieve this.

Completed the first tutorial