Full level completion with 100% Primary Objectives, 100% Bonus Objectives & 100% New Intel Gathered on normal difficulty.
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This is rather simple on normal difficulty - capture all but one of the minor production facilities (I chose to leave a simple Barracks - easy enough to destroy). Simply destroy the last one to complete the mission once you have achieved the Bonus Objectives (build a GDI Mammoth Tank and a Scrin Tripod).
As for obtaining the Bonus Objectives, make sure you capture the Scrin Technology Assembler at the southeast base, and the GDI Tech Center in the northwest, as well as a couple other upgraded GDI Power Plants (in the northwest) or Scrin Reactors for extra power.
Set a Saboteur near each of the structures you desire to capture, and press Ctrl+z to change to planning mode. Order each of your Saboteurs into a building, then press Ctrl+z when ready to capture everything at once. Immediately begin building a Mammoth Tank and a Tripod. Destroy the last remaining building to complete the mission.