stk-code/data/challenges/unlock_supertux.challenge

<?xml version="1.0"?>
<challenge version="3">
    <unlock_list list="true"/>
    <!-- This is the  point equivalent of finishing the
         story mode with all gold except 14 silver challenges -->
    <requirements trophies="250"/>
    <alt_requirements max-req-in-lower-diff="5"/>
    <unlock difficulty="difficulty_best"/>
</challenge>