Here is the full list of all 23 The Sun at Night achievements.
Defeat the Soviet VTOL.
Return the frog to its rightful home in the sewers beneath the Animal Testing Facility.
Read each heartfelt, lovingly-crafted entry in Laika’s Credits Room.
Finish the game with the frog in your inventory.
Peacefully resolve Laika’s conversation with the Sphinx.
Defeat the Sphinx in single combat.
Right now, from now on, and forever.
Find all four affirmations of love.
Locate each encrypted ciphertext (and the associated decryption keys) hidden throughout the Catacombs and Castle Base Gamayun.
Locate and return Pavel’s Wrench.
Finish the game with Pavel’s Wrench still in Laika’s inventory.
Activate the Blast Doors and save the prisoners from the Reactor Core meltdown.
Access the art aficionado’s locked chambers, tucked away in the barracks in Level 4.
Subdue the livestock in the Animal Testing Facility by releasing pheromones into the air supply.
Defeat the Dual-Rotor Warbird.
Defeat the Cyber Elephant.
Defeat the Nanocore.
Defeat the Manta.
Defeat the Cyber Whale.
Unlock all 6 weapons.
Block 1,000 damage.
Collect 100 Nano Batteries.
Unlock every skill in any skill tree.