Mars Horizon

Launch an animal into Earth orbit

Launch a human into Earth orbit before April, 1961

Complete the Crewed Moon Landing mission before July, 1969

Land on the Moon before any other space agency

Complete a mission to any of the Outer Planets

Complete a mission to any of the Inner Planets, excluding Earth

Complete an Orbital EVA

Launch a Space Telescope into orbit

Complete the Grand Tour

Land an Exploratory Rover on Mars

Complete a Modular Space Station

Complete every Milestone mission in a single game

Finish 1st in every Milestone mission in a single game on normal difficulty or above

Land humans on Mars

Complete all 4 Mars Preparation missions

Land humans on Mars in a Joint mission with another agency

Successfully launch a vehicle in Terrible conditions

Explode a Sounding Rocket

Launch a vehicle with a 1% chance of Critical Failure... which explodes

Launch a mission using a reusable launch vehicle

Launch any vehicle except Sounding Rocket with 99% Launch Reliability

Launch a crewed moon mission using a Saturn V booster

Launch any vehicle except Sounding Rocket with 50% or lower Launch Reliability

Reach the maximum Experience Level for a vehicle part

Complete a mission with a Payload that has 50% or lower Payload Reliability

Complete a mission with a Payload that has 99% Payload Reliability

Complete every Research in every Research Tree in a single game

Complete every Research in the Vehicles Tree

Complete every Research in the Buildings Tree

Complete every Research in the Missions Tree

Unlock an Era Completion reward in a Research Tree

Complete a Challenging Request Mission

Complete a Joint Mission

Complete a Publicised Request Mission using a Celebrity astronaut

Complete a mission using an astronaut above the age of 70

Send an astronaut on a mission one month before their retirement

Complete Human in Space, Orbital EVA, Mulitcrew Orbit, and Crewed Moon Landing using the same astronaut

Hire a Tier 3 astronaut

Remove every obstruction from your base

Construct a small, medium, and large launchpad

Have a single building with 6 active Positive Adjacency effects

Become Allied with all other agencies

Complete the Bonus Objective of a mission task

Complete every Bonus Objective on a mission with at least 3 tasks

Achieve a mission task's Bonus Objective with the last Command of the last turn

Complete a mission task with 30 or more Thrust

Complete a mission task with 50 or more Data

Complete a mission task with 50 or more Comms

Complete the Bonus Objective of a mission task that involves Heat

Complete a mission task that requires Drift to be exactly 0

Win the Race to Mars

Place an Artificial Satellite in orbit

Fly a helicopter on Mars?!

Successfully land a reusable rocket

Successfully complete the Space Tourism request mission

Successfully completed the Philae Landing mission.