Here is the full list of all 16 Scrappage achievements.
Die Once.
Kill 100 enemies.
Eliminate a target.
Collect 5000 scrap.
Collect 100 pickups.
Heal 1000 HP.
Kill a boss with two shields
Clear a level without taking damage.
Find a legendary item.
Win a run in normal difficulty.
Win a run in hardcore difficulty.
Deal more than 5000 damage in a single blow.
Get a drone.
Defeat the final boss as Martha.
Defeat the final boss in a wheel chair.
Defeat the final boss with extra enemies in hardcore.