Here is the full list of all 80 Elena's Journal - there are Unfinished Expedition achievements.
Price the statues.
Decorate Elena's office.
Watch all ingame cutscenes.
Complete levels with at least 1 star.
Collect diamonds.
Finish all levels on location University.
Complete levels with 3 stars.
Give out indexes to students.
Make photocopies of students' papers.
Sign students' documents.
Finish all levels on location Vineyard.
Give out sandwiches.
Finish all levels on location Excavations.
Finish all levels on location Amazons' city.
Assemble arrows.
Collect cups by completing side objectives.
Find lizards.
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.
Sell antiques.
Get 'full order' bonuses.
Checkout customers with 5 hearts.
Get 'quick service' bonuses.
Get 'all clean' bonus.
Replay 5 levels.
Complete first level tutorial.