Here is the full list of all 74 World End Diner achievements.
Diner Lv1
Diner Lv2
Diner Lv3
Diner Lv4
Diner Lv5
Diner Lv6
Diner Lv7
Diner Lv8
Diner Lv9
Diner Lv10
Diner Lv12
Diner Lv14
Diner Lv16
Diner Lv18
Open a treasure chest 100 times
Help a lost child 100 times
Let Yumyum.CL1034 eat the item 100 times
Treat injured animals and robots with medicine 100 times
Arbitration of quarrels 100 times
Fishing 100 times
Employ part-time 100 times
Invite 5 friends with diner code
Cook a salad 1000 times.
1000 Guests in INN
Souvenir shelf sales 1000 times
Take-out sales 1000 times
AP Analysis 100 times
Baby Raccoon jump 100 times
Baby Fox jump 100 times
Cooking Strawberry Cake 1000 times
Cook Burger 1000 times
Cook Cola 1000 times
Cook Bacon and Scrambled egg 1000 times
Petting a white chicken 100 times
Petting a black chicken 100 times
Petting a young goat 100 times
Petting a cat 100 times
"Too far" 1000 times
Baby deer jump 100 times
Unlocked 25 recipes
Unlock 50 recipes
Unlock 15 gathering skills
Unlock 30 gathering skills
Unlock 25 clover skills
Unlock 50 clover skills
Baby wolf jump 100 times
Baby penguin jump 100 times
Diner Lv20
Unlocked 75 recipes
Unlock 75 clover skills
Unlock 100 clover skills
Unlock 125 clover skills
Unlock 150 clover skills
Baby bear jump 100 times
Diner Lv22
1000 items to Yumyum.CL1034
Unlocked 100 recipes
Petting a baby goat 100 times
Petting a chick 100 times
Bonfire food sales 1000 time
Sales at the counter 1000 times
Sales at the counter 10000 times
Sales at ther counter 100000 times
Diner Lv24
Petting a kitten 100 times
Diner Lv26
Baby rabbitjump 100 times
Diner Lv28
Unlock 175 clover skills
Unlock 200 clover skills
10 dishes of Rank 5 or higher
20 dishes of Rank 5 or higher
30 dishes of Rank 5 or higher
Diner Lv30