Here is the full list of all 43 STAR WARS Battlefront II achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Complete 25 Multiplayer Milestones.
Win a match of Starfighter Assault.
In Multiplayer, boost 100 allies with the Officer commands.
Engage in an Arcade match.
Win a match of Strike.
Win a match of Galactic Assault.
Be the first one to defeat an enemy in a Multiplayer match.
Win a match of Heroes vs Villains
Win one match in each Multiplayer game mode.
Win a match of Blast.
Complete the mission "The Cleaner".
Complete the mission "The Battle of Endor".
Complete the mission "The Dauntless".
Complete the mission "The Observatory".
Complete the mission "The Storm".
Complete the mission "The Outcasts".
Complete the mission "Royalty".
Complete the mission "General Distress".
Complete the mission "Under Covered Skies".
Complete the mission "Cache Grab".
Complete the mission "The Battle of Jakku".
Complete the mission "Until Ashes".
Complete the mission "Discoveries".
In the Campaign, use the Droid to shock three enemies at once.
In the Campaign, eliminate five enemies at once using the Barrage.
In the Campaign, destroy eight starfighters in the skies of Jakku.
In the Campaign, eliminate a Scout Trooper with Iden’s melee takedown.
Reach Rank 25.
Reach Rank 50.
In Multiplayer, defeat 3 enemies within one Vanguard usage 5 times.
In Multiplayer, defeat 150 enemies with the Heavy's Sentry Gun.
In Multiplayer, get 25 headshots with longblaster rifles.
Get 20 Killstreaks with Interceptor ships.
Defeat 50 enemies using Dual Proton Torpedoes with the Bomber ship class.
Defeat 25 Hero ships with Fighter ships.
Complete all unique Battle Scenarios.
Destroy 25 objectives in Starfighter Assault.
Defeat 50 enemies in Heroes Vs Villains.
Play as all launch heroes in Multiplayer.
Defeat 500 enemies as a hero on any Multiplayer map.
Complete the mission "Project: Resurrection".
Complete the mission "Ashes of the Empire".
Complete the mission "Inferno".