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