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