Located the Ark

Defeated Richter

Destroy a Titan with your Sword Core in the Campaign

Acquire 6 or more friendly Stalkers at the same time in the Campaign

That's not right

Found the Arc Tool

Destroy a Titan with your Salvo Core in the Campaign

Defeated Ash

Defeated the Reapers in Ash's Simulation Dome

Entered the World Foundry

Destroy a Titan with your Burst Core in the Campaign

Completed training

Croft Manor: Collect all of the Relics in Croft Manor