Here is the full list of all 27 Max: The Curse of Brotherhood achievements.
You defeated Mustacho and saved your brother!
You lit 15 enemies on fire. Oh the things One does for brotherly love.
You destroyed 50 of Mustacho's Evil Eyes. His control is diminishing!
You drew 200 water streams.
You drew 200 vines.
You found and assembled 6 pieces of the lost Amulet.
You destroyed 25 of Mustacho's Evil Eyes. Consider his surveillance network impaired.
You drew 200 branches.
What goes around, comes around. Right in your face.
Can't Touch This
Up you go.
You found the first piece of the lost Amulet.
You destroyed 5 of Mustacho's Evil Eyes. That'll teach him.
You used the magic marker 25 times.
You tamed the Spikester! ...Lucky you.
Time Marches On. (Rang a bell)
And just in time for tea! (Reached the old lady in under 5 minutes)
You stole back your kid brother like a boss!
Guts and Glory
One Sea of Sand, 2 Earth Pillars, 3 drawings - piece of cake.
You defeated Mustacho without dying even once!
You found and assembled the entire Amulet for the Old Lady!
It's all in the fingers and fiery balls of death.
No Evil is safe from you and your Grabby Hands.
You found and assembled 12 pieces of the lost Amulet.
You didn't die in Death By Lava.
You escaped the Beast without dying!