Here is the full list of all 29 FRONT MISSION 1st: Remake achievements.
Complete the UCS campaign
Recruit all team members in the UCS campaign
Prevent enemy units from reaching the central building
Do not lose a single supply unit in Gentz's attack
Win a skirmish with Grieg's team
Meet Morgan, Randy, Hector, Walter, Billy, Darril and Ernest
Watch a feature about the outbreak of the war
Destroy HAH04 Cassowary before it reaches the final waypoint
Defeat Driscoll in 2090
Complete the OCU campaign
Achieve the highest level in three piloting statistics
Recruit all team members in the OCU campaign
Clear the Karen valley of enemy units
Help Glen at Fort Monus
Meet Griff
Achieve the highest level in one piloting statistic
Recover all items before explosives destroy the carriage
Thwart the enemy's plan to blow up the dam
Damage an enemy unit with a BA mine
Destroy 100 enemy Wanzers
Defeat Hell's Walls within the first 10 turns
Eliminate Gina inside the weapons depot
Complete the mission alone
Win 10 fights in the Arena
Change the paint of the Wanzer
Complete the mission without losing a single unit
Locate the rebel camp
Obtain all the available mobile weapons in the game
Earn all the remaining achievements