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