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