Rush Streak
In order to get these achievements follow the steps (starting in home page):
- mouseover Puzzles menu -> click on Puzzles
- from the menu in the right select Puzzle Rush
- select Survival and click Play
- try to have as many as you can solved in consecutive order!
Note: either of the 3 variants work for these achievements, but it's obviously easier to get them in Survival, you have more time to think.
There are at least 4 overlapping achievements as follows:
- if you solve at least 5 consecutive puzzles you get Rush Streak 5
- if you solve at least 10 consecutive puzzles you get Rush Streak 10
- if you solve at least 20 consecutive puzzles you get Rush Streak 20
- if you solve at least 30 consecutive puzzles you get Rush Streak 30
Note: the achievements might continue beyond 30, but I didn't manage to find any player that has them.
Here is the link that takes you there directly.