Here is the full list of all 16 Scrapper achievements.
Completed a mission on any difficulty
Get 50,000 points in a single run
Earn a cumulative total of 500,000 points
Upgrade your Scrapper rank to level 2
Upgrade your Scrapper rank to level 10
Unlock a total of ten different ship parts
Unlock a total of twenty one different ship parts
Completed a mission on hard difficulty
Earn a total of 2000 scrap
Have 1000 unspent scrap
Complete a goal mission
Complete a collect mission
Complete a survive mission
Complete a checkpoint mission
Upgrade your Scrapper rank to level 19
Roll for one minute without stopping or dying