Here is a full list of 77 Steam achievements you can unlock by activating certain occurances in Football Manager.

However you feel about Steam achievements, they are by far one of the largest additions to Football Manager ever made. Achievements extend the play time on our favourite footy simulation, and give us that warm feeling inside whenever ‘ACHIEVEMENT UNLOCKED’ pops up.
If you're anything like me, you've probably wondered what exactly are Steam Achievements? Do they have a deeper purpose, or are they here just to boost our moral a bit and keep us playing more Football Manager?
What are Steam Achievements?
Steam Achievements are rewards for completing game objectives or performing pre-determined actions in a Football Manager. The Steam Community Overlay will notify you when you have unlocked an achievement in Steam. Your achievements can be viewed in the game's main menu or through the stats in the Steam Community.
What is the point of Football Manager 2018 Steam Achievements?
Prepare yourself for disappointment if you were looking for a deeper meaning to achievements. Other than the bragging rights within the Football Manager community, there is no other purpose for collecting Steam achievements. They will not add up to Football Manager leader-board, nor will they unlock some hidden features in the game.
How many Steam achievements for Football Manager there is?
For the current version, Football Manager 2018, there is a total of 77 Steam achievements to be collected playing both the regular version and online game.
My Steam Achievements are not being recorded
Steam will not grant achievements if you're playing Football Manager in the offline mode. You need to be online to collect achievements.
Achievements are also not recorded while playing in Commentary Mode or when the in-game editor is enabled. If you would like to ensure that your Football Manager achievements are tracked correctly, please do not play your game in any of these modes.
So without further staling, here is the full list of 77 Steam achievements that are in the latest version of Football Manager. The % number shows how much players have unlocked this particular achievement.
Football Manager Steam Achievements

78.8%
He's Signed!
You signed a player for your team

77.4%
First Victory
You guided your team to victory in a competitive fixture

76.6%
Clean Sheet
You played a competitive match without conceding a goal

72.4%
He's Sold!
You sold a player to another team

68.2%
Hat-trick
Your player scored a hat-trick in a competitive match

63.8%
Scoring Streak
Your team scored in 10 consecutive competitive matches

60.6%
Thumping
Your team won a competitive match by at least 5 goals

60.2%
Unbeatable!
Your team was unbeaten in 10 consecutive competitive matches

59.4%
Team Performance
Five of your players were named in a team of the week

54.2%
Record Signing
You broke your club's record transfer fee spent on a player

49.5%
Star Man
One of your players was selected in the Team Of The Year

46.4%
Attack!
Your team scored a goal in 20 consecutive competitive matches

45.6%
Top Of The Class
You won a manager of the month award

44.4%
Parked The Bus
Your team didn't concede a goal in 5 consecutive competitive games

43.5%
Record Sale
You broke your club's record transfer fee received for a player

43.4%
Unstoppable Force
Your team scored the most league goals over an entire season

42.2%
Tremendous Trio
3 of your players were selected in the Team Of The Year

40.2%
You're On Fire
You won 10 consecutive competitive matches

39.1%
Splashing The Cash
You bought a player for £50 million or more

39.0%
I'm The Boss!
You fined one of your clubs players

39.0%
On A Roll
Your team hasn't lost in 20 matches

38.9%
The Boss
You won the Manager Of The Year award

38.1%
Armchair Expert
You have watched match goals/highlights on the pop up viewer

37.8%
What A Goal!
Your player collected a goal of the month award

37.7%
Shrewd Spender
You have gained 90% board confidence in controlling the club's wage bill

36.7%
Full Faith
You have gained 90% overall board confidence

35.7%
Goal Machine
Your player was the top league goalscorer over an entire season

34.2%
Cup Glory!
You won a top domestic cup

33.0%
Iron Curtain
Your team conceded the least league goals over an entire season

32.7%
Fantastic Five
5 of your players were selected in the Team Of The Year

30.4%
Irresistible Force
Your team scored a goal in 30 consecutive competitive matches

30.1%
Cash To Burn
You sold a player for £50 million or more

26.6%
Do The Double
You won a nation's top league and cup competitions in the same season

24.7%
Comeback King!
You won a competitive match after being 2 or more goals down at half-time

23.6%
Top Form
Your team hasn't lost in 30 matches

21.1%
Overachiever!
Your team was chosen as the league overachieving team

19.5%
You're Up!
Guide your team to promotion in a domestic league

19.3%
Beating Expectations
You have gained 90% board confidence in overall competitions

16.3%
International Superstar
One of your players was selected in the World Cup Best XI

14.6%
Headhunted
You were offered a job by a larger team than you were managing

13.9%
Superb Strike
Your player collected a goal of the season award

13.8%
Best In The World
Your player won the World Player Of The Year award

13.7%
National Service
You were offered a job in senior international management

13.6%
Best In Europe
Your player won a European Player award

12.3%
Invincible!
Your team played the entire season without losing a league game

11.8%
Best In The Business
You have won the Manager Of The Month award 10 times

10.7%
Window Shopping
You visited the in-game store

10.4%
We Trust You
You gained the trust of the board to select a feeder team

10.1%
World Renowned
You have made it into the worldwide hall of fame

9.9%
Head-to-Head
You have won a match against another person on a Network Game

9.2%
Community Spirit
You downloaded an item from the Steam Workshop

8.9%
Manager on the Touchline
You used PhotoFit for your Manager Profile

7.6%
Parked The Tank
Your team didn't concede a goal in 10 consecutive competitive matches

7.3%
Domination
You have won 3 consecutive top division league titles

6.4%
Legend
You have won the Manager Of The Year award 5 times

6.2%
Golden Boot
Your player was the top scorer at a World Cup

4.8%
Going Places
Your board decide to build a new stadium

3.8%
Trophy Hoarder
You have won 20 cup competitions

3.1%
National Hero
You have won promotion from the bottom to the top division in a nation

2.9%
On Top Of The World
You have won the World Cup

2.5%
Childhood Dream
Get offered the chance to manage your favourite team

1.8%
Freedom Of The Country
You have won an international continental competition

1.7%
The Greatest
You have become the greatest manager of all-time!

1.5%
Part Of The Furniture
You have stayed at one club for 10 seasons

1.4%
Community Leader
You published an item to the Steam Workshop

1.2%
Icon
You have received 10 Manager Of The Year awards

0.8%
Confederations Winner
You have won the Confederations Cup

0.7%
Living the Dream
You have played against an AI team in Fantasy Draft Mode

0.6%
Invitational
You invited a friend to a Network Game

0.6%
Beat your Mates
You won a Fantasy Draft competition

0.5%
Outstanding Defence
Your team didn't concede a goal in 20 consecutive competitive matches

0.2%
Immovable Object
Your team hasn't conceded a goal in 30 consecutive competitive matches

0.2%
Club Legend
You have stayed at one club for 20 seasons

0.2%
Value For Money
Congratulations! You have played Football Manager for 30 seasons

0.1%
Immortality
You have received 20 Manager Of The Year awards

0.1%
Video Director
You uploaded a video to YouTube

0.1%