The Separate Ways Add-on for Resident Evil 4 has 7 achievements.
Defeat El Gigante in Separate Ways.
Defeat Pesanta in Separate Ways.
Defeat Osmund Saddler in Separate Ways.
Complete Separate Ways on Standard mode or higher.
Complete Separate Ways on Hardcore mode or higher.
Complete Separate Ways on Professional mode.
Complete Separate Ways on Professional mode with an S+ rank.