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