Here is the full list of all 24 The Real Texas achievements.
get all the diamonds
kill a bear
get a message for Cal
find all the tapes using an online guide
find all treasures described in Secret Legendary Items of the Legendary Heroes of Ages Past
walk through fire without getting hurt
talk to all the ghosts
come back from the dead
figure out what happened to Laffs
reach the end
shoot 20 times in 3 seconds
shoot a bat that is currently biting you
shoot a lit stick a' dynamite
shoot your hat
open the chest in Tucky's shop
shoot yourself
find out what happened to Bunnybeard
shoot 30 times in 3 seconds
kill a metallic lizard
unlock all faerie stones
finish Cellpop Goes Out At Night
eat all the mint snappers
find all the gemstones
own all the outfits from Charlit's at one time