Hi,

There is no simple definition of an easy achievement, but I think achievements that can be obtained quickly should not be too complicated. Therefore, a good approach is to determine the time it takes to earn an achievement.

That's why I collected some statistics from Exophase, an achievement tracking website. I used only available games with at least 10 players submitted achievement information to have a more reliable base. I totaled all the achievements and the playtime of every player. Then I divided the results to get the average time per achievement.

So here is the top 25 list of games with achievements that can be obtained quickly. I also added the completion rate (= percentage of players who obtained all achievements).

Name - Number of Achievements - Average Time per Achievement - Completion Rate
Alder's Blood Prologue - 20 - 0.04h - 49%
Pilgrims - 45 - 0.05h - 64%
Florence - 12 - 0.08h - 75%
Martial Law - 6 - 0.09h - 75%
Dagon: by H. P. Lovecraft - 6 - 0.12h - 74%
Song of Farca: Prologue - 8 - 0.12h - 63%
METAL SLUG - 15 - 0.13h - 1%
Reventure - 101 - 0.13h - 38%
One Dreamer: Prologue - 9 - 0.15h - 29%
Tonight We Riot - 31 - 0.17h - 19%
Donut County - 20 - 0.18h - 46%
The Walking Dead: Michonne - A Telltale Miniseries - 21 - 0.19h - 73%
Down in Bermuda - 25 - 0.19h - 38%
Project Highrise - 86 - 0.19h - 0%
Epistory - Typing Chronicles - 55 - 0.19h - 0%
Kane & Lynch 2: Dog Days - Complete Edition - 41 - 0.21h - 0%
METAL SLUG 2 - 15 - 0.23h - 3%
Bombshell - 39 - 0.23h - 0%
There Is No Game: Wrong Dimension - 34 - 0.19h - 50%
Nightmare Reaper - 149 - 0.24h - 0%
METAL SLUG 3 - 30 - 0.25h - 3%
AER – Memories of Old - 20 - 0.25h - 33%
Destroy All Humans! - 40 - 0.25h - 18%
Deponia 3: Goodbye Deponia - 50 - 0.25h - 36%
Shadwen - 48 - 0.25h - 50%

Please notice that this calculation has limitations:
- Data on Exophase might not be accurate.
- Not all achievements are included in games with a 0% completion rate.

Many greetings!

and, that the last post in this thread was nearly 5 years ago...