Here is the full list of all 56 Before We Leave achievements.
Build 10 Spaceships across all games
Demolish 1000 forests across all games
Finish the game
Maintain a full Shield for 1 in-game hour around a Planet with only Wind and Solar generators
Fully protect a Planet with a Shield
Survive 20 Whale Attacks across all games
Tame a Gremlin Nest
Colonise an innermost Planet
Colonise 20 Islands across all games
Destroy a Ship by creating crystal Island under it
Tame a Kraken
Use a Transmogrifier 30 times across all games
Tame a Minotaur
Make 1000 Gadgets across all games
Prevent a Whale attack with a Space Elevator
Make 100 Gadgets across all games
Build 20 Ships across all games
Survive a whale attack
Create 500 Peeps across all games
Build 100 Huts across all games
Demolish 100 forests across all games
Colonise a Planet
Repair the Spaceship
Repair the Ship
Make a Tool at a Toolsmith
Colonise an outermost Planet
Tame a Sphinx
Repair the Ship in 15 in-game minutes
Repair the Spaceship in 90 in-game minutes
Click on a frog
Hide all Peeps on a Planet in Shelters during a Whale attack
Have 100+ Peeps on Island, all of them happy and living in Apartments. Also have 10 Fountains and no pollution on that Island
Colonise 7 Planets in 1 game
Have all Peeps wearing Good Clothing
Have one Island with 300+ Peeps on it, all with homes
Have one Island with 200+ Peeps, all happy and housed
Have 100+ Peeps, all happy and housed, on an Island that's never had fields or Extractor, Industry or Quality of Life buildings on it
Repair Spaceship without ever demolishing a Forest
Have 100 Peeps on an Island without ever building a School there
Finish the game without ever building a cleaner
Colonise Islands of all 6 biomes and have a population of at least 50 Peeps on each of them
50+ Peeps, all happy, on an inner or outer Planet Island, fed with only potatoes and water
Complete the Apocalypse Soon scenario
Lose 20+ buildings in one whale attack
Have 100+ Peeps in a game, all of them Very Sad
Have a Planet with every Island tile polluted (apart from tiny islands), with default pollution difficulty settings
Complete the Seed Hunter scenario
Complete the Hut-Owners Association scenario
Complete the Getting Busy scenario
Build 1000 Huts across all games
Create 5000 Peeps across all games
Colonise 100 Islands across all games
Survive 100 Whale Attacks across all games
Use a Transmogrifier 200 times across all games
Build 100 Spaceships across all games
Build 200 Ships across all games