Here is the full list of all 15 JYDGE achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Upgrade four Gavel firemodes to the max.
Get all medals for all missions of the Acts on Grim difficulty.
Purchase all cyberware.
Get all medals for all missions of the Acts on Hardcore difficulty.
Get all medals for all missions of the Acts on Normal difficulty.
Purchase all weapon mods.
Complete the third act.
Complete the second act.
Rescue 50 Citizens.
Complete the first act.
Get three medals in any mission in one difficulty.
Complete the game as the hero of the citizens.
Get all medals for all missions of the Acts on Nightmare difficulty.
Upgrade four special weapons to max.
Find all collectibles.