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