Here is the full list of all 33 Rise of the Triad: Ludicrous Edition achievements.
Free a moving wall from the confines of reality
Enter a warp-only level
Defeat El Oscuro while eliminating his eggs
Get some serious air with a firebomb jump without dying
Beat "Dark War"
Defeat El Oscuro without eliminating all of his eggs
Find the entrance to "Switched Around"
Roast five enemies in one firewall shot
Kill an enemy by landing on its head
Defeat the NME
Kill five enemies in one level with the Excalibat special attack
Defeat Sebastian "Doyle" Krist
Finish any level with all enemies killed and all secrets found
Find the entrance to "Elevator Trouble"
Defeat General Darian
Kill two enemies with a split missile
Kill three enemies with a Dog Mode Powerup bark blast
Beat any level in "Extreme ROTT"
Get to the very end of "The HUNT Begins" end-of-episode messages
Beat "The HUNT Begins"
Kill five enemies with a single God Mode Powerup fireball
Kill a Lightning Guard who previously played dead
Gib an enemy while under the influence of the Shrooms Mode Powerdown
Get an extra life by collecting Ankhs
Earn a Ludicrous Gibs Bonus
Beat "The HUNT Continues"
Find the entrance to "Wall to Wall"
Find the entrance to "Turn of the Screw"
Find the entrance to "Eight Ways to Hell"
Find the Developer Ball
Find the Incredible Ball
Find the Power Ball
Find Scott's Mystical Head