Here is the full list of all 48 Sonic Forces achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Collected all parts
Collected all Wispons
Achieved highest honors with all races
Completed all Challenge Missions
Completed 10 Daily Missions
Collected a total of 100,000 rings. (All Rings held at the end of the stage will be counted.)
Collected a total of 50,000 rings. (All Rings held at the end of the stage will be counted.)
Defeated 10,000 enemies
Equipped a part in every slot
Collected all Silver Moon Rings in Shadow's Story.
Collected all Number Rings in Shadow's Story.
Collected all Red Star Rings in Shadow's Story.
Collected all Silver Moon Rings
Collected all Number Rings
Cleared all Secret Stages
Cleared all EX Stages
Collected 30 Wispons
Created your second Avatar
Restored peace to the world
Collected all Red Star Rings
Collected 500 parts
Defeated Infinite
Turned the tide of the conflict
Defeated 5,000 enemies
Completed 5 Daily Missions
Drove off Infinite again
Completed 10 SOS Missions
Completed 3 Daily Missions
Liberated a world
Completed 5 SOS Missions
Collected a total of 10,000 rings. (All Rings held at the end of the stage will be counted.)
Collected 10 Wispons
Achieved a soldier's highest honor
Used the Closet
Changed Wispons for the first time
Completed your first SOS Mission
Drove off Eggman
Collected 100 parts
Drove off Infinite
Defeated 1,000 enemies
Collected 50 parts
Defeated Zavok
Utilized the Rental Avatar function
Collected Silver Moon Rings three times
Collected Number Rings three times
Made it into the rankings
Created an Avatar
Cleared Stage 1