I tried to balance some achievement payment by difficulty+time spent to get, that’s the result.
Plaza:
Photographer: 1,500 -> 5,000
Arcade:
Meteoroid Mania:
Armageddon 10,000 -> 5,000 
ITEOTWAWKI: 5,000 -> 10,000
ITEOTWAWKI more luck-based than Armageddon.
Fishing:
Gone Fishin’: 10,000 -> 25,000
A Rare Find: 10,000 -> 5,000
For catching one of Rare Fish you get same amount of units as for 100 of any kind of fish, that’s just ridiculous.
Trivia:
Trivia Millionaire: 10,000 -> 25,000
Trivia Brainiac: 10,000 -> 25,000
Trivia Show Off: 1,500 -> 5,000
Drop and Roll!: 1,500 -> 5,000
Millionaire and Brainiac are two hardest Trivia achievements to get, it takes much time and requires knowledge… or typing speed to search for right answer.
Bowling:
Tournament Bowler: 5,000 -> 10,000
No Time To Spare: 5,000 -> 10,000
Keeping The Gutters Clean: 1,500 -> 5,000
Laser Tag:
Apprentice: 1,500 -> 5,000
Terminator: 5,000 -> 10,000
Grim Reaper: 1,500 -> 5,000
Laser Tag Master (x50 1st place) gives you 10,000 units, when Apprentice (x20 1st place) gives only 1,500 units.
Typing Derby:
Gone In 60 Seconds: 5,000 -> 10,000
Condo:
Silver Cat: 25,000 -> 10,000
Home Sweet Home: 10,000 -> 5,000
Silver Cat: It’s not rare as Golden Catsack and purchasable, but achievement gives you same amount of units as for Gold Cat.
For two hours of spending time in your Condo you get same amount of units as for 10 hours you spend watching TV in Condo.
Accelerate:
Nice In!: 1,500 -> 5,000
Minigolf:
Ancient Mariner: 1,500 -> 5,000
Little Crusaders:
Ultimate Cape Crusader: 5,000 -> 25,000
Count of Knightsend-by-sea: 1,500 -> 10,000
Knightsend-by-sea Destruction: 1,500 -> 10,000
Unlike other “Count” and “Eat all the Knights” achievements, these two have 1,500 instead of 10,000 units as payment.
Virus:
Bragging Rights: 1,500 -> 10,000
.
I also would like to know your opinion about this.