So I broke the new achievements down to this list:
NEW_ACHIEVEMENT_NAME_145_24
NEW_ACHIEVEMENT_NAME_145_25
NEW_ACHIEVEMENT_NAME_145_26
NEW_ACHIEVEMENT_NAME_145_27
NEW_ACHIEVEMENT_NAME_145_28
NEW_ACHIEVEMENT_NAME_145_29
NEW_ACHIEVEMENT_NAME_145_30
NEW_ACHIEVEMENT_NAME_145_31
NEW_ACHIEVEMENT_NAME_147_0
NEW_ACHIEVEMENT_NAME_147_1
NEW_ACHIEVEMENT_NAME_147_2
NEW_ACHIEVEMENT_NAME_147_3
NEW_ACHIEVEMENT_NAME_147_4
NEW_ACHIEVEMENT_NAME_147_5
NEW_ACHIEVEMENT_NAME_147_6
NEW_ACHIEVEMENT_NAME_147_7
NEW_ACHIEVEMENT_NAME_147_8
NEW_ACHIEVEMENT_NAME_147_9
NEW_ACHIEVEMENT_NAME_147_10
NEW_ACHIEVEMENT_NAME_147_11
NEW_ACHIEVEMENT_NAME_147_12
NEW_ACHIEVEMENT_NAME_147_13
NEW_ACHIEVEMENT_NAME_147_14
NEW_ACHIEVEMENT_NAME_147_15
NEW_ACHIEVEMENT_NAME_147_16
NEW_ACHIEVEMENT_NAME_147_17
NEW_ACHIEVEMENT_NAME_147_18
NEW_ACHIEVEMENT_NAME_147_19
NEW_ACHIEVEMENT_NAME_147_20
NEW_ACHIEVEMENT_NAME_147_21
NEW_ACHIEVEMENT_NAME_147_22
NEW_ACHIEVEMENT_NAME_147_23
NEW_ACHIEVEMENT_NAME_147_24
NEW_ACHIEVEMENT_NAME_147_25
NEW_ACHIEVEMENT_NAME_147_26
NEW_ACHIEVEMENT_NAME_147_27
NEW_ACHIEVEMENT_NAME_147_28
NEW_ACHIEVEMENT_NAME_147_29
NEW_ACHIEVEMENT_NAME_147_30
NEW_ACHIEVEMENT_NAME_147_31
NEW_ACHIEVEMENT_NAME_148_0
NEW_ACHIEVEMENT_NAME_148_1
NEW_ACHIEVEMENT_NAME_148_2
NEW_ACHIEVEMENT_NAME_148_3
NEW_ACHIEVEMENT_NAME_148_4
NEW_ACHIEVEMENT_NAME_148_5
NEW_ACHIEVEMENT_NAME_148_6
NEW_ACHIEVEMENT_NAME_148_7
NEW_ACHIEVEMENT_NAME_148_8
NEW_ACHIEVEMENT_NAME_148_9
NEW_ACHIEVEMENT_NAME_148_10
NEW_ACHIEVEMENT_NAME_148_11
NEW_ACHIEVEMENT_NAME_148_12
NEW_ACHIEVEMENT_NAME_148_13
NEW_ACHIEVEMENT_NAME_148_14
NEW_ACHIEVEMENT_NAME_148_15
NEW_ACHIEVEMENT_NAME_148_16
NEW_ACHIEVEMENT_NAME_148_17
NEW_ACHIEVEMENT_NAME_148_18
NEW_ACHIEVEMENT_NAME_148_19
There are three categories here, 145, 147, and 148.
Assuming there will be nine victory achievements for each leader, and nine special achievements for each civ, along with additional achievements for the new game mechanics, only category 147 is large enough for all of them.
So I'm speculating that there will be 32 general achievements, and 20 scenario achievements, but what are the other 8? And why does 145 start at 24, what's missing?
That's going from the global achievement stats, I haven't looked at the debug file yet.
Edit: Seems someone else made the same observation earlier in the thread...