Here is the full list of all 23 Walking Heavy achievements.
Complete the first level.
Skip the tutorial.
Have £1000 or more.
Have £20,000 or more.
Kill 13 pedestrians.
Make 100 drug deals.
Carry 100 drugs.
Own all weapons.
Own all purchasable items.
Have £1,000,000 or more.
Kill a target and have the body crushed by a train.
Reach level 5 without being spotted by the police.
Reach level 10 without being spotted by the police.
Cause a power cut.
Get hit by a train.
Take out the target with a sniper rifle at maximum range.
Kill yourself with a grenade.
Kill 10 police officers.
Kill 100 police officers.
Kill 1000 police officers.
Search every bin on a single level.
Kill 100 pedestrians in a single level.
Visit Macclesfield.