Full list of all 71 Mars Horizon achievements.
The base game contains 65 achievements, and there are 2 DLC packs containing 6 achievements.
Win the Race to Mars on hard difficulty or above
Win the Race to Mars on very hard difficulty
Complete every other Mars Horizon achievement
Win the Race to Mars with all 5 space agencies
Succeed a launch using an N1 booster
Finish 1st in every Milestone mission in a single game on normal difficulty or above
Land humans on Mars in a Joint mission with another agency
Complete a mission using an astronaut above the age of 70
Become Allied with all other agencies
Complete a Publicised Request Mission using a Celebrity astronaut
Complete a Joint mission with an Antagonistic agency
Place an Artificial Satellite in orbit before October, 1957
Complete every Milestone mission in a single game
Land humans on Mars
Win the Race to Mars
Complete a mission task with 30 or more Thrust
Complete all 4 Mars Preparation missions
Complete a flyby of Pluto
Complete a mission task with 50 or more Data
Complete every Research in every Research Tree in a single game
Complete every Research in the Missions Tree
Hire a Tier 3 astronaut
Send an astronaut on a mission one month before their retirement
Complete the Grand Tour
Land an Exploratory Rover on Mars
Complete every Research in the Vehicles Tree
Launch a Space Telescope into orbit
Complete a Modular Space Station
Complete a mission task with 50 or more Comms
Complete missions to every planet in the Solar System in a single game
Launch a mission using a reusable spaceplane
Complete every Research in the Buildings Tree
Remove every obstruction from your base
Complete a mission task with 1% Payload Reliability at the end of it
Complete a mission to any of the Outer Planets
Launch a vehicle with a 1% chance of Critical Failure... which explodes
Have a single building with 6 active Positive Adjacency effects
Complete the Crewed Moon Landing mission
Complete the Crewed Moon Landing mission before July, 1969
Land on the Moon before any other space agency
Complete Human in Space, Orbital EVA, Mulitcrew Orbit, and Crewed Moon Landing using the same astronaut
Launch a crewed moon mission using a Saturn V booster
Launch a human into Earth orbit before April, 1961
Complete a mission with a Payload that has 99% Payload Reliability
Launch any vehicle except Sounding Rocket with 50% or lower Launch Reliability
Construct a small, medium, and large launchpad
Complete an Orbital EVA
Complete every Bonus Objective on a mission with at least 3 tasks
Complete a mission task that requires Drift to be exactly 0
Complete the Bonus Objective of a mission task that involves Heat
Complete a Joint Mission
Launch a human into Earth orbit
Complete a mission to any of the Inner Planets, excluding Earth
Complete a mission with a Payload that has 50% or lower Payload Reliability
Launch any vehicle except Sounding Rocket with 99% Launch Reliability
Unlock an Era Completion reward in a Research Tree
Successfully launch a vehicle in Terrible conditions
Launch an animal into Earth orbit
Reach the maximum Experience Level for a vehicle part
Complete a Challenging Request Mission
Achieve a mission task's Bonus Objective with the last Command of the last turn
Complete all Tutorial Objectives
Place an Artificial Satellite in orbit
Complete the Bonus Objective of a mission task
Explode a Sounding Rocket
Win the race to Mars on Iron Core
Fly a helicopter on Mars?!
Successfully land a reusable rocket
Explore Mars using the Zhurong Rover.
Successfully completed the Philae Landing mission.
Successfully complete the Space Tourism request mission