Adventures completed outside a den or pack activity need to be recorded in advancements.scouting.org. You can enter individual requirements as they are completed; you do not need to finish the entire adventure at once.
Record completed adventure requirements
Login to https://advancements.scouting.org/ and Make sure you are currently viewing Pack 905 (top right)
Click on Youth profile on the left
Click View More to the right of your den level (i.e. Lions, Tigers etc.).
Click on the adventure which you have completed
Fill in the completion date for each requirement completed and a comment.