Here is the full list of all 27 Max: The Curse of Brotherhood achievements.
You didn't die in Death By Lava.
One Sea of Sand, 2 Earth Pillars, 3 drawings - piece of cake.
You defeated Mustacho without dying even once!
You escaped the Beast without dying!
No Evil is safe from you and your Grabby Hands.
You found and assembled the entire Amulet for the Old Lady!
And just in time for tea! (Reached the old lady in under 5 minutes)
Time Marches On. (Rang a bell)
You tamed the Spikester! ...Lucky you.
You defeated Mustacho and saved your brother!
You stole back your kid brother like a boss!
Can't Touch This
You found and assembled 12 pieces of the lost Amulet.
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 drew 200 vines.
You found and assembled 6 pieces of the lost Amulet.
You drew 200 branches.
You destroyed 25 of Mustacho's Evil Eyes. Consider his surveillance network impaired.
What goes around, comes around. Right in your face.
Guts and Glory
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.