Here is the full list of all 101 Little hidden city achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
the end of the game
find traffic light
find basketball
find air conditioning
find bicycle
find flower_palicious
find football_ball
find boat_old
find slide
find motorcycle
find solar_battery
find cat
find telescope
find gazebo
find sculpture_rock
find wheelchair
find tractor
find inflatable pool
find medical bed
find VOLGA
find camera
find satellite_talk
find power station
find statue
find pointer
find electric car
find swing
find TV
find water_motocycle
complete a level gas station
find haystack
find part of the train
find muffler
find canister_2
find extinguisher
find hovel
find logs
find soona
find Jack
find equipment for garage
find canister
find old car
find army trailer
find strut
find barrel
find wheel_2
find wheel
find spare part
find engine
pass_level_supermarket
find bank_register
find stool
find shoe
find bucket_washing brush
find carton
find soft toy
find cake_shocolate
find moped
find pac_products
find steak_sibs
find fish
find eggplants
find jacket
find basket
find watermelon
find drawer
find trolley
find bananas
find handbag_female
find sink
pass_level_country house
find stairs
find bucket of apples
find watering can
find log
find plant_in_roof
find Boots
find tools
find potty
find watering can_2
find light
pass_level_busstation
find stroller
find nameplate
find bicycle_old
find shoes
find bottles
find suitcase_02
find suitcase_opened
find newspaper
pass_level_apartment
find tube
find magnifying_glass
find bag
find suitcase
find book
find strap
find hat
find umbrella
find coat
start the game