Here is the full list of all 14 Bob Help Them achievements.
Achieve the 10th level
Help the chef for the first time!
Help the forger for the first time
Pet the doggo!
Help the fisherman for the first time
Help the lumberjack for the first time
Help the farmer for the first time
Achieve the 30th level
Achieve the 20th level
Get at least one star in every level
Get at least two stars in every level
Get three star in every level
Achieve the 40th level
Achieve the 50th level