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