Here is the full list of all 56 Home Sheep Home 2 achievements.
Complete Farm level 15
Complete Farm level 10
Complete Farm level 5
Complete Farm level 1
Achieve every other achievement
Complete Underground level 6 with TNT to spare
Complete all story levels with three star ratings
Beat the developers' time on any one level
Get all three sheep flying together using the chimney
Cross Big Ben's clockface without moving the hands
Complete all bonus levels
Complete any ten bonus levels
Find every joypad to unlock all bonus levels
Collect everything possible from every level!
Find every hidden cake to unlock all bonus modes
Find every wooly sock in the game
Don't touch the football in Space level 6
Get a photo of every sheep in London level 3
Surf the camper van home in London level 15
Change sheep selection just once in Space level 14
Complete Underground level 4 without using any TNT
Complete London level 1 with the luggage on board
Complete thirty levels with three star ratings
Toast Shaun on a rocket in the last space level
Find a giant cake to unlock developer commentary
Complete all episodes
Complete Space level 15
Complete Space level 10
Find seventy five socks, a lifetime's supply
Complete Space level 5
Solve Space level 4 with only two teleport swaps
Complete Space level 1
Complete London level 15
Find fifty socks, enough for any sheep
Complete London level 10
Complete any five bonus levels
Complete London level 5 with all chimneys intact
Complete London level 5
Smash 5 speed cameras in a row in London level 3
Complete London level 1
Use just 2 'chutes to survive the mineshaft fall
Complete Underground level 15
Unlock the Space episode by finding 24 cosy socks
Complete Underground level 10
Unlock the London episode by finding 12 socks
Complete five levels with three star ratings
Complete Underground level 5
Complete any one bonus level
Unlock a bonus level by finding a hidden joypad
Find a hidden cake to unlock a special bonus mode
Complete any level with a three star rating
Complete Underground level 1
Find two missing wooly socks
Complete Ewe-niversity training
Complete Further Ed-ewe-cation training
Complete Graze School training