Here is the full list of all 31 Big Journey to Home achievements.
Find the first secret in the single-player game
Slay your first monster
Complete all co-op levels and get a score above the game norm
Complete all singleplayer levels and get a score above the game norm
Find all in-game secrets within one playthrough
Submit 10 rooms to the community
Complete the game in Hardcore mode
Complete a single-player level without dying in Hardcore mode
Complete the game
Complete all the co-op levels
Submit 5 rooms to the community
Kill 1,000 monsters in singleplayer mode
Complete a singleplayer level without dying
Complete the first level with an above-the-norm score
Complete the second level with an above-the-norm score
Complete the third level with an above-the-norm score
Complete the fourth level with an above-the-norm score
Complete the fifth level with an above-the-norm score
Complete the sixth level with an above-the-norm score
Complete the seventh level with an above-the-norm score
Complete the eighth level with an above-the-norm score
Complete the ninth level with an above-the-norm score
Complete the tenth level with an above-the-norm score
Complete the eleventh level with an above-the-norm score
Complete the twelth level with an above-the-norm score
Submit the first room to the community
Play a single co-op level
Complete the Forest location
Complete the Underground location
Complete the Ice Caves location
Complete the Desert location