Here is the full list of all 15 Railway Islands 2 - there are Puzzle achievements.
Finish level 1.
Maybe you forgot something.
Finish island 20!
Finish island 10!
Upload your island to workshop!
Finish island 30!
something is wrong!
Finish level 25!
Finish level 15.
Start island 19.
Train collision!
Finish level 40!
Finish island 35.
Enter on wrong tunnel!
Switch the rails!