Here is the full list of all 50 Rise of Nightmares achievements worth 1,000 gamerscore.
Defeated at least 100 creatures with a powered weapon.
Defeated at least 50 creatures with a fist-type weapon.
Defeated at least 500 creatures.
Defeated at least 50 creatures using only punches and kicks.
Defeated at least 20 creatures with the slicer.
Kicked open a door.
Cleared Act 4.
Cleared Act 5.
Cleared Act 6.
Cleared Act 7.
Cleared Act 8.
Cleared the main game on the "No Mercy" difficulty level.
Defeated at least 50 creatures using arm weapons dropped by creatures.
Beheaded 50 creatures.
Defeated at least three creatures in one swing.
Performed at least 50 dodge gestures in battle.
Defeated every type of creature.
Defeated at least 50 creatures with a wood-cutting weapon.
Cleared Act 3.
Defeated at least 100 creatures.
Cleared Act 2.
Found a Tarot Card for the first time.
Cleared Act 1.
Found a Detective's Tape for the first time.
Discovered your first "Secret Event."
Cleared Act 0.
Defeated your first creature.
Used a gesture to operate an object for the first time.
Began the Nightmare.
This is a secret achievement. Unlock it to find out more about it.
Attacks from below are effective against creatures too.
Keep swinging that knife.
You can use tools too.
Keep tossing those tubes.
Let loose with loads of energy.
Plants aren't the only things you can prune and trim.
Such fierce strength.
Kick'em to their doom!
Burn baby, burn!
Dismember a single creature while leaving it alive.
Pick up every weapon you see.