Here is the full list of all 67 RUMP! - there are It's a Jump and Rump! achievements.
Kill 25 player
Reset 50 times
Pass 100 checkpoints in race games
Use 100 Booster
Pass 10 checkpoints in race games
Die for the first time
Jump 100 times
Play a multiplayer game
Kill one player
Jump for the first time
Use a Booster
Jump 1.000 times
Jump 50.000 times
Reset 150 times
Reset 500 times
Reset 5.000 times
Die 100 times
Die 1.000 times
Collect 5 gold medals
Collect 10 gold medals
Collect 20 gold medals
Collect 100 coins
Collect 1.000 coins
Collect 9.001 coins
Collect 25.000 coins
Collect 50.000 coins
Complete the tutorial zone
Complete all levels in the sky zone
Complete all levels in the park zone
Complete all levels in the canals zone
Complete all levels in the construction zone
Complete all levels in the night zone
Complete the first boss level
Complete chapter I
Find all golden Rumps in the tutorial zone
Find all golden Rumps in the sky zone
Find all golden Rumps in the park zone
Find all golden Rumps in the sewers zone
Find all golden Rumps in the construction zone
Find all golden Rumps in the night zone
Find all golden Rumps in the first boss level
Find all golden Rumps in chapter I
Get all gold medals in the tutorial zone
Get all gold medals in the sky zone
Get all gold medals in the park zone
Get all gold medals in the sewers zone
Get all gold medals in the construction zone
Get all gold medals in the night zone
Get the gold medal in the boss zone
Get all gold medals from chapter I
Unlock the cow
Unlock a cow level
Kill 150 player
Kill 500 player
Collect 30 gold medals
Jump 10.000 times
Use 500 Booster
Use 2.500 Booster
Get anything from the shop
Get 5 items from the shop
Get 10 items from the shop
Play 25 multiplayer games
Play 100 multiplayer games
Complete all cow levels
Fire 50 orbital lasers in race games
Get hit by 50 orbital lasers in race games
Pass 500 checkpoints in race games