Here is the full list of all 80 Elena's Journal - there are Unfinished Expedition achievements.
Complete levels with at least 1 star.
Replay 5 levels.
Collect cups by completing side objectives.
Find lizards.
Complete levels with 3 stars.
Sign students' documents.
Make photocopies of students' papers.
Give out indexes to students.
Fix pocket watches.
Sell antiques.
Price the statues.
Clean up bugs from grapes.
Give out sandwiches.
Sell bottles of wine.
Give out water.
Photograph the discoveries.
Dig up artifacts.
Polish up shields.
Assemble arrows.
Give out weapons to the Amazons.
Checkout customers with 5 hearts.
Watch all ingame cutscenes.
Get 'all clean' bonus.
Get 'quick service' bonuses.
Get 'full order' bonuses.
Complete first level tutorial.
Decorate Elena's office.
Collect diamonds.
Finish all levels on location Antique Shop.
Finish all levels on location Vineyard.
Finish all levels on location Excavations.
Finish all levels on location Amazons' city.
Unlock all characters from Photo album.
Finish all levels on location University.