Here is the full list of all 18 Metrico+ achievements.
Completed World 2 in one play session without dying
Found a collectible
Interacted with all forms of input, right at the start of World 1
Found all collectibles
Completed World 1 in one play sessions without jumping more than 43 times
Completed World 3 in one play session while killing less than 18 enemies
Completed World 4 in one play session without ever walking left
Completed World 5 in one play session without missing a single shot.
Completed World 6 in one play session without using the restart button
In World 2, connect all platforms with a line
Completed World 1 in Speedrun mode in under: 2:34 seconds.
Completed World 2 in Speedrun mode in under: 2:24 seconds.
Completed World 3 in Speedrun mode in under: 3:43 seconds.
Completed World 4 in Speedrun mode in under: 4:06 seconds.
Completed World 5 in Speedrun mode in under: 3:56 seconds.
Completed World 6 in Speedrun mode in under: 6:30 seconds.
Found 50% of all collectibles.
Completed all other achievements.