Here is the full list of all 21 El Paso, Elsewhere achievements.
Save 10 hostages.
Clear the first Landmark level.
Roll 150 times.
Clear the tutorial.
Find all Pill Cop segments.
Find all projectors.
Defeat Draculae.
Defeat Djedefre.
Get the "Scars Fade" ending.
Get the "Thanks for Believing" ending.
Collect the Uzi.
Collect the Launcher.
Stake 250 enemies.
Dive 150 times.
Hit 1,000 weak points.
Heal 50 times.
Kill 5 hostages.
Kill the Puppeteer for the first time.
Kill the Burned Man.
Kill the Angel.
Kill a mega enemy.