Mars Horizon achievements

Complete all 4 Mars Preparation missions

Land humans on Mars

Hire a Tier 3 astronaut

Launch a Space Telescope into orbit

Complete a Modular Space Station

Complete every Research in the Vehicles Tree

Launch a crewed moon mission using a Saturn V booster

Launch a mission using a reusable spaceplane

Have a single building with 6 active Positive Adjacency effects

Land on the Moon before any other space agency

Remove every obstruction from your base

Complete a mission to any of the Outer Planets