Here is the full list of all 42 Journey of Johann achievements.
Beat 25 Levels
Beat 50 Levels
Beat 75 Levels
Beat ALL Levels
Find 25 Secrets
Find 50 Secrets
Find 75 Secrets
Find ALL Secrets
Collect all Goblets on 25 Levels
Collect all Goblets on 50 Levels
Collect all Goblets on 75 Levels
Collect all Goblets on ALL Levels
Beat 25 Silver Time Trials
Beat 50 Silver Time Trials
Beat 75 Silver Time Trials
Beat ALL Silver Time Trials
Beat 25 Gold Time Trials
Beat 50 Gold Time Trials
Beat 75 Gold Time Trials
Beat ALL Gold Time Trials
Beat 1 Gold Time Trial with 5 Seconds or More
Beat 5 Gold Time Trials with 5 Seconds or More
Beat 10 Gold Time Trials with 5 Seconds or More
Beat 15 Gold Time Trials with 5 Seconds or More
Beat 10 Levels without losing Health
Beat 25 Levels without losing Health
Beat 50 Levels without losing Health
Beat 75 Levels without losing Health
Cut down the Great Tree
Adopt Goatlings
Overthrow King Janne
Defeat Flameskull
Eliminate Karlxon
Clear Prototype Island
Clear Goat Island
Clear DLC Island
Become the Voice Actor
Absolutely Fabulous
What have you done!?
Die by your own blade
Have a 30 Minutes or Lower Main Sum of Best
Have a 10 Minutes or Lower Bonus Sum of Best