Here is the full list of all 45 Railroad Ink Challenge achievements.
Build a Highway that stretches for 15 spaces or more.
Finish a game with 3 or more separate Networks that connect all exits.
Finish a game without filling any of the Central Spaces.
Finish a game filling all the Central Spaces.
Activate all Factories.
Finish a game with the longest Highway and Railway of the same length.
Finish a game with 3 or more separate Networks.
Activate all Villages.
Activate all Universities.
Finish a game with a score of 65 or more, filling all the corner spaces.
Finish a game with a score of 70 or higher.
Finish a game with a score of 60 or higher.
Build a Railway that stretches for 15 spaces or more.
Finish a game with a score of 50 or higher.
Finish a game with a single Network.
Complete all Goals before the requested turn.
Finish a game with no Errors.
Finish a game with a score of 80 or higher.
Finish a game with a score of 90 or higher.
Finish a game with a score of 20 or lower.
Finish a game with a negative score.
Finish a game with a single Network that connects all the exits.
Build a Highway that stretches for 20 spaces or more.
Build a Railway that stretches for 20 spaces or more.
Finish a game with a score of 65 or more, without using any Special Route.
Win 3 Challenges against your friends.
Play 10 games in Score Attack.
Play 50 games in Score Attack.
Play 100 games in Score Attack.
Win a Challenge against 2 or more Friends.
Enter the best score in the Base Game Score Attack Daily Leaderboard.
Enter the top 10 of the Base Game Score Attack Daily Leaderboard.
Enter the top 30 of the Base Game Score Attack Daily Leaderboard.
Enter the top 10 of the Base Game Score Attack Monthly Leaderboard.
Enter the top 30 of the Base Game Score Attack Monthly Leaderboard.
Win a Challenge against 5 or more Friends.
Win a Challenge against 10 or more Friends.
Create 50 Challenges inviting 1 or more Friends.
Win a Challenge with a score of 50 or more.
Win a Challenge with a score of 60 or more.
Win a Challenge with a score of 70 or more.
Win a Challenge with a score of 80 or more.
Beat a friend that challenged you.
Complete a challenge with 10 or more friends
Get all base game Trophies.